Chapter 10 - Guidelines for the Collection of Long-Term Pavement Performance Data, FHWA Report No. FHWA-RD-06-067 - LTPP - Pavements

Chapter 10. Traffic Data

10.1 Introduction to Traffic Data

Traffic data are collected separately for the lanes (or lane) being monitored. Because each lane experiences different traffic, each should be considered as a separate test section. For LTPP, data collection is planned only for the outside lane in one direction.

The traffic data include distribution of traffic by vehicle classes; days of data collected; and distribution of axle loads for single, tandem, and tridem axles by vehicle class. For locations where traffic data have been submitted for all lanes, the data may include average annual daily traffic (AADT) and percent trucks.

Data forms have been developed to capture information on sections inservice before the start of monitoring in 1990. Data collected from 1990 forward been submitted in one of the electronic record formats documented in FHWA's Traffic Monitoring Guide (TMG), second through fourth editions. Data are submitted between twice a month and annually depending on the practices of the individual agencies. Except for special cases, monthly submittal is preferred, and quarterly is typical. In the absence of electronic data on a section, a set of data forms has been provided for recording estimates of traffic during that timeframe.

Data for individual vehicles require considerable computer storage, so these are expected to be stored offline rather than directly in the LTPP IMS. Appropriate summary data such as numbers of axles in certain weight categories, vehicles in certain classes, equivalent axle loads, etc., are to be calculated from the raw data and stored in the LTPP IMS. The raw data will be available for use when needed.

The traffic data file will include both historical data before initiation of the monitoring activity and data collected throughout the monitoring period. Data have been submitted using the TMG classification schemes (Truck Weight Study 6-digit and 13-bin) as well as agency-defined schemes. All offline data and daily summaries are provided in the classification scheme used for submission. All data provided from online sources summarized at the monthly or annual level are in the TMG 13-bin classification scheme. The database does not contain information on the algorithms used or the changes that may have been made to the algorithms over time. Thus, for example, the impact of large pickups cannot be explicitly traced in the data.

Traffic data reporting for LTPP is separated into two categories: historical and monitoring. Historical traffic data are defined to cover the period from the dates the pavement sections were initially opened to traffic (or from the date of the most recent overlay or rehabilitation project) through 1989. The overall purpose of historical traffic data collection is to obtain the best estimate of annual traffic levels on each test section before the time monitoring began on that section. The monitored traffic data cover traffic data collection activities initiated for monitoring the LTPP test section.

10.2 References Used in Collecting Traffic Data

10.2.1 Traffic Data Collection Plans

The DCG provides a detailed description for collecting historical data and a general description for collecting monitored traffic data.

Data Collection Guide for Long-Term Pavement Performance Studies, Operational Guide No. SHRP-LTPP-OG-001, SHRP, National Research Council, Washington, DC, January 1988, chapter 4.
Data Collection Guide for Long-Term Pavement Performance Studies, Operational Guide No. SHRP-LTPP-OG-001, FHWA, Pavement Performance Division, McLean, VA, October 1993, chapter 4.

The following document provided a revised and more detailed plan for the collection and processing of traffic data to prepare the data for entry into the IMS.

Revised Data Collection Plan for LTPP Sites, FHWA, Pavement Performance Division, McLean, VA, April 1998.

Additionally, a separate document was issued providing a procedure to check the equipment used in traffic data collection.

Long-Term Pavement Performance Program Protocol for Calibrating Traffic Data Collection Equipment, FHWA, Pavement Performance Division, McLean, VA, April 1998.

The Revised Data Collection Plan and the Protocol for Calibrating Traffic Data Collection Equipment were subsequently combined into a single document along with all the additional required information used in collecting traffic data for the LTPP program.

Guide to LTPP Traffic Data Collection and Processing, FHWA, Pavement Performance Division, McLean, VA, April 2000.
Guide to LTPP Traffic Data Collection and Processing, FHWA, Pavement Performance Division, McLean, VA, March 2001.

A separate set of documents was prepared to provide guidelines for collecting data at SPS projects. The following references provide specific requirements for performance of weigh-in-motion (WIM) equipment at these locations and collection of data at SPS projects.

Pavement Smoothness Specifications for LTPP SPS WIM Locations, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2001.
WIM Calibration Check Specifications Check for LTPP SPS Sites, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2001.
Draft—Data Collection Guide for SPS WIM Sites, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2001.

The following two documents provide details on equipment installation requirements for bending plate WIM equipment.

LTPP Bending Plate Weigh-in-Motion System: Model Specifications for Equipment—Hardware and Software, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2000.
LTPP Bending Plate Weigh-in-Motion System: Model Specifications for Pavement and Installation, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2000.

The following document, which will codify a range of operational practices, is under development.

Traffic Operations Guide, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, June 2005.

10.2.2 Software Guides

Software to perform quality control checks and process/accumulate the desired data to be stored in the IMS has been a very important part of traffic data collection.

The first set of software guides was issued in 1997.

LTPP SPS Traffic Processing Users Guide, FHWA, Pavement Performance Division, McLean, VA, June 1997.
LTPP Traffic Software Users Guide, FHWA, Pavement Performance Division, McLean, VA, June 1997.
LTPP Traffic Software Technical Documentation, FHWA, Pavement Performance Division, McLean, VA, July 1997.
LTPP Traffic QC Software, Technical Documentation, FHWA, Pavement Performance Division, McLean, VA, 1997.
LTPP Traffic Database Librarian Software, Version 4.0, FHWA, Pavement Performance Division, McLean, VA, April 24, 1997.
LTPP Level 4 Traffic Quality Control Analysis Users Manual, FHWA, Pavement Performance Division, McLean, VA, June 1997.
Running the Level 4 Traffic Quality Control Filter Program, FHWA, Pavement Performance Division, McLean, VA, June 1997.
Users Manual for Level 3 through 1 LTPP Traffic Quality Control Software, FHWA, Pavement Performance Division, McLean, VA, July 1997.
Managing Purge Document Using Purge Operations Software, FHWA, Pavement Performance Division, McLean, VA, February 1998.

The software for performing quality control checks and data analysis has been revised and reissued. The documents referenced below provide the guidelines for use with this revised software.

LTPP Traffic QC Software Volume 1: Users' Guide, Version 1.5, FHWA, Pavement Performance Division, McLean, VA, December 2000.
LTPP Traffic QC Software Volume 1: Users' Guide, Version 1.6.1, FHWA, Pavement Performance Division, McLean, VA, November 2001.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.0, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, February 28, 2002.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.0, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, April 10, 2002.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.1, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002.
Traffic Analysis Software, Volume 1—User's Guide, Version 1.2, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, November 1, 2002.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.2.1, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 10, 2003.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.3, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.3.1, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 29, 2003.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.3.3, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.4, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 14, 2004.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.4.1, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 1, 2004.
Traffic Analysis Software, Volume 1—Users' Guide, Version 1.5, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, February 4, 2005.
Traffic Analysis Software, Volume 1, Appendix A—Database Manipulation and Troubleshooting, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 1, 2004.
Traffic Analysis Software, Volume 1, Appendix A—Database Manipulation and Troubleshooting, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, February 4, 2005.
LTPP Traffic Analysis Software Volume 3—ORACLE Table Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 14, 2002.
LTPP Traffic Analysis Software Volume 3—ORACLE Table Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003.
LTPP Traffic Analysis Software Volume 3—ORACLE Table Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 14, 2004.
LTPP Traffic Analysis Software Volume 3—ORACLE Table Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, February 4, 2005.
LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 14, 2002.
LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002.
LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, July 30, 2002.
LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003.
LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 6, 2004.
LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 14, 2004.
LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 25, 2005.
LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 27, 2002.
LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, July 30, 2002.
LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003.
LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 14, 2004.
LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 14, 2004.
LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 25, 2005.
LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 27, 2002.
LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, April 30, 2002.
LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, July 30, 2002.
LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003.
LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 7, 2004.
LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 30, 2004.
LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 26, 2005.
LTPP Traffic Analysis Software Volume 3, Appendices D through F—Table Population and Maintenance, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 27, 2002.
LTPP Traffic Analysis Software Volume 3, Appendices D through F—Table Population and Maintenance, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, July 30, 2002.
LTPP Traffic Analysis Software Volume 3, Appendices D through F—Table Population and Maintenance, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 30, 2004.
LTPP Traffic Analysis Software Volume 4—Design Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 14, 2002.
LTPP Traffic Analysis Software Volume 4—Design Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, June 29, 2003.
LTPP Traffic Analysis Software Volume 5—Specifications for Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 3, 2001.
LTPP Traffic Analysis Software Volume 5—Specifications for Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 9, 2002.
LTPP Traffic Analysis Software Volume 5—Specifications for Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 17, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix A—SPS Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix A—SPS Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix A—SPS Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 31, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix A—SPS Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003.
LTPP Traffic Analysis Software Volume 5, Appendix B—Agency Graphics, FHWA, Office of Infrastructure Research, Development, McLean, VA, March 29, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix B—Agency Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix B—Agency Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 31, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix B—Agency Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003
LTPP Traffic Analysis Software Volume 5, Appendix C—13-bin Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix C—13-bin Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix C—13-bin Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003.
LTPP Traffic Analysis Software Volume 5, Appendix D—Classification Error Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix D—Classification Error Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix D—Classification Error Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003.
LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 19, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003.
LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003.
LTPP Traffic Analysis Software Volume 5, Appendix F—STAT_QC Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix F—STAT_QC Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix F—STAT_QC Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 23, 2002.
LTPP Traffic Analysis Software Volume 5, Appendix F—STAT_QC Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003.

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Data Collection Analysis Products Pooled Fund Studies Operations/Analysis Feedback Reports LTPP Customer Survey	Chapter 10. Traffic Data 10.1 Introduction to Traffic Data Traffic data are collected separately for the lanes (or lane) being monitored. Because each lane experiences different traffic, each should be considered as a separate test section. For LTPP, data collection is planned only for the outside lane in one direction. The traffic data include distribution of traffic by vehicle classes; days of data collected; and distribution of axle loads for single, tandem, and tridem axles by vehicle class. For locations where traffic data have been submitted for all lanes, the data may include average annual daily traffic (AADT) and percent trucks. Data forms have been developed to capture information on sections inservice before the start of monitoring in 1990. Data collected from 1990 forward been submitted in one of the electronic record formats documented in FHWA's Traffic Monitoring Guide (TMG), second through fourth editions. Data are submitted between twice a month and annually depending on the practices of the individual agencies. Except for special cases, monthly submittal is preferred, and quarterly is typical. In the absence of electronic data on a section, a set of data forms has been provided for recording estimates of traffic during that timeframe. Data for individual vehicles require considerable computer storage, so these are expected to be stored offline rather than directly in the LTPP IMS. Appropriate summary data such as numbers of axles in certain weight categories, vehicles in certain classes, equivalent axle loads, etc., are to be calculated from the raw data and stored in the LTPP IMS. The raw data will be available for use when needed. The traffic data file will include both historical data before initiation of the monitoring activity and data collected throughout the monitoring period. Data have been submitted using the TMG classification schemes (Truck Weight Study 6-digit and 13-bin) as well as agency-defined schemes. All offline data and daily summaries are provided in the classification scheme used for submission. All data provided from online sources summarized at the monthly or annual level are in the TMG 13-bin classification scheme. The database does not contain information on the algorithms used or the changes that may have been made to the algorithms over time. Thus, for example, the impact of large pickups cannot be explicitly traced in the data. Traffic data reporting for LTPP is separated into two categories: historical and monitoring. Historical traffic data are defined to cover the period from the dates the pavement sections were initially opened to traffic (or from the date of the most recent overlay or rehabilitation project) through 1989. The overall purpose of historical traffic data collection is to obtain the best estimate of annual traffic levels on each test section before the time monitoring began on that section. The monitored traffic data cover traffic data collection activities initiated for monitoring the LTPP test section. 10.2 References Used in Collecting Traffic Data 10.2.1 Traffic Data Collection Plans The DCG provides a detailed description for collecting historical data and a general description for collecting monitored traffic data. Data Collection Guide for Long-Term Pavement Performance Studies, Operational Guide No. SHRP-LTPP-OG-001, SHRP, National Research Council, Washington, DC, January 1988, chapter 4. Data Collection Guide for Long-Term Pavement Performance Studies, Operational Guide No. SHRP-LTPP-OG-001, FHWA, Pavement Performance Division, McLean, VA, October 1993, chapter 4. The following document provided a revised and more detailed plan for the collection and processing of traffic data to prepare the data for entry into the IMS. Revised Data Collection Plan for LTPP Sites, FHWA, Pavement Performance Division, McLean, VA, April 1998. Additionally, a separate document was issued providing a procedure to check the equipment used in traffic data collection. Long-Term Pavement Performance Program Protocol for Calibrating Traffic Data Collection Equipment, FHWA, Pavement Performance Division, McLean, VA, April 1998. The Revised Data Collection Plan and the Protocol for Calibrating Traffic Data Collection Equipment were subsequently combined into a single document along with all the additional required information used in collecting traffic data for the LTPP program. Guide to LTPP Traffic Data Collection and Processing, FHWA, Pavement Performance Division, McLean, VA, April 2000. Guide to LTPP Traffic Data Collection and Processing, FHWA, Pavement Performance Division, McLean, VA, March 2001. A separate set of documents was prepared to provide guidelines for collecting data at SPS projects. The following references provide specific requirements for performance of weigh-in-motion (WIM) equipment at these locations and collection of data at SPS projects. Pavement Smoothness Specifications for LTPP SPS WIM Locations, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2001. WIM Calibration Check Specifications Check for LTPP SPS Sites, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2001. Draft—Data Collection Guide for SPS WIM Sites, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2001. The following two documents provide details on equipment installation requirements for bending plate WIM equipment. LTPP Bending Plate Weigh-in-Motion System: Model Specifications for Equipment—Hardware and Software, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2000. LTPP Bending Plate Weigh-in-Motion System: Model Specifications for Pavement and Installation, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, August 2000. The following document, which will codify a range of operational practices, is under development. Traffic Operations Guide, Version 1.0, FHWA, Pavement Performance Division, McLean, VA, June 2005. 10.2.2 Software Guides Software to perform quality control checks and process/accumulate the desired data to be stored in the IMS has been a very important part of traffic data collection. The first set of software guides was issued in 1997. LTPP SPS Traffic Processing Users Guide, FHWA, Pavement Performance Division, McLean, VA, June 1997. LTPP Traffic Software Users Guide, FHWA, Pavement Performance Division, McLean, VA, June 1997. LTPP Traffic Software Technical Documentation, FHWA, Pavement Performance Division, McLean, VA, July 1997. LTPP Traffic QC Software, Technical Documentation, FHWA, Pavement Performance Division, McLean, VA, 1997. LTPP Traffic Database Librarian Software, Version 4.0, FHWA, Pavement Performance Division, McLean, VA, April 24, 1997. LTPP Level 4 Traffic Quality Control Analysis Users Manual, FHWA, Pavement Performance Division, McLean, VA, June 1997. Running the Level 4 Traffic Quality Control Filter Program, FHWA, Pavement Performance Division, McLean, VA, June 1997. Users Manual for Level 3 through 1 LTPP Traffic Quality Control Software, FHWA, Pavement Performance Division, McLean, VA, July 1997. Managing Purge Document Using Purge Operations Software, FHWA, Pavement Performance Division, McLean, VA, February 1998. The software for performing quality control checks and data analysis has been revised and reissued. The documents referenced below provide the guidelines for use with this revised software. LTPP Traffic QC Software Volume 1: Users' Guide, Version 1.5, FHWA, Pavement Performance Division, McLean, VA, December 2000. LTPP Traffic QC Software Volume 1: Users' Guide, Version 1.6.1, FHWA, Pavement Performance Division, McLean, VA, November 2001. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.0, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, February 28, 2002. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.0, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, April 10, 2002. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.1, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002. Traffic Analysis Software, Volume 1—User's Guide, Version 1.2, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, November 1, 2002. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.2.1, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 10, 2003. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.3, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.3.1, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 29, 2003. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.3.3, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.4, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 14, 2004. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.4.1, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 1, 2004. Traffic Analysis Software, Volume 1—Users' Guide, Version 1.5, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, February 4, 2005. Traffic Analysis Software, Volume 1, Appendix A—Database Manipulation and Troubleshooting, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 1, 2004. Traffic Analysis Software, Volume 1, Appendix A—Database Manipulation and Troubleshooting, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, February 4, 2005. LTPP Traffic Analysis Software Volume 3—ORACLE Table Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 14, 2002. LTPP Traffic Analysis Software Volume 3—ORACLE Table Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003. LTPP Traffic Analysis Software Volume 3—ORACLE Table Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 14, 2004. LTPP Traffic Analysis Software Volume 3—ORACLE Table Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, February 4, 2005. LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 14, 2002. LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002. LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, July 30, 2002. LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003. LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 6, 2004. LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 14, 2004. LTPP Traffic Analysis Software Volume 3, Appendix A—Table Schemas, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 25, 2005. LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 27, 2002. LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, July 30, 2002. LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003. LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 14, 2004. LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 14, 2004. LTPP Traffic Analysis Software Volume 3, Appendix B—Codes Listing, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 25, 2005. LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 27, 2002. LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, April 30, 2002. LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, July 30, 2002. LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003. LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 7, 2004. LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 30, 2004. LTPP Traffic Analysis Software Volume 3, Appendix C—QC Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 26, 2005. LTPP Traffic Analysis Software Volume 3, Appendices D through F—Table Population and Maintenance, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 27, 2002. LTPP Traffic Analysis Software Volume 3, Appendices D through F—Table Population and Maintenance, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, July 30, 2002. LTPP Traffic Analysis Software Volume 3, Appendices D through F—Table Population and Maintenance, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 30, 2004. LTPP Traffic Analysis Software Volume 4—Design Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, January 14, 2002. LTPP Traffic Analysis Software Volume 4—Design Specifications, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, June 29, 2003. LTPP Traffic Analysis Software Volume 5—Specifications for Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 3, 2001. LTPP Traffic Analysis Software Volume 5—Specifications for Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 9, 2002. LTPP Traffic Analysis Software Volume 5—Specifications for Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, September 17, 2002. LTPP Traffic Analysis Software Volume 5, Appendix A—SPS Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002. LTPP Traffic Analysis Software Volume 5, Appendix A—SPS Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002. LTPP Traffic Analysis Software Volume 5, Appendix A—SPS Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 31, 2002. LTPP Traffic Analysis Software Volume 5, Appendix A—SPS Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003. LTPP Traffic Analysis Software Volume 5, Appendix B—Agency Graphics, FHWA, Office of Infrastructure Research, Development, McLean, VA, March 29, 2002. LTPP Traffic Analysis Software Volume 5, Appendix B—Agency Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002. LTPP Traffic Analysis Software Volume 5, Appendix B—Agency Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 31, 2002. LTPP Traffic Analysis Software Volume 5, Appendix B—Agency Graphics, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003 LTPP Traffic Analysis Software Volume 5, Appendix C—13-bin Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002. LTPP Traffic Analysis Software Volume 5, Appendix C—13-bin Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002. LTPP Traffic Analysis Software Volume 5, Appendix C—13-bin Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003. LTPP Traffic Analysis Software Volume 5, Appendix D—Classification Error Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002. LTPP Traffic Analysis Software Volume 5, Appendix D—Classification Error Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002. LTPP Traffic Analysis Software Volume 5, Appendix D—Classification Error Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003. LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002. LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, May 19, 2002. LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002. LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2002. LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 7, 2003. LTPP Traffic Analysis Software Volume 5, Appendix E—ESAL Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003. LTPP Traffic Analysis Software Volume 5, Appendix F—STAT_QC Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, March 29, 2002. LTPP Traffic Analysis Software Volume 5, Appendix F—STAT_QC Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, August 1, 2002. LTPP Traffic Analysis Software Volume 5, Appendix F—STAT_QC Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 23, 2002. LTPP Traffic Analysis Software Volume 5, Appendix F—STAT_QC Graphs, FHWA, Office of Infrastructure Research, Development, and Technology, McLean, VA, October 21, 2003. Previous \| Table of Contents \| Next	Events View all Upcoming Pavements Events More Information Pavement Publications Contact Aramis Lopez Turner Fairbank 202-493-3145 E-mail Aramis
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Chapter 10. Traffic Data

10.1 Introduction to Traffic Data

10.2 References Used in Collecting Traffic Data

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