Twopas Model Improvements

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1. INTRODUCTION

The proposal for the NCHRP 3-55(3) project "Capacity and Quality of Service of Two-Lane Highways" was submitted in May 1995 and the contract was awarded to MRI in the early fall of 1995. A working plan was submitted in October 1995 and work on the project began immediately.

The project was divided into eight major tasks with the first four tasks being designated as Phase I and the last four tasks being designated as Phase II. The eight major tasks were:

Task 1	Identify Capabilities and Deficiencies of Existing Methods
Task 2	Develop an Improved Conceptual Framework for Capacity and Level of
	Service Analysis
Task 3	Select	a	Suitable Simulation Model and Identify Desirable Functional
	Improvements
Task 4	Prepare Interim Report
Task 5	Collect and Analyze Data
Task 6	Enhance, Calibrate, and Validate the Selected Simulation Model
Task 7	Develop Revised Capacity and Quality of Service Analysis Procedures for
	Two-Lane Highways
Task 8	Prepare Final Report

This report deals with Task 6 "Enhance, Calibrate, and Validate the Selected Simulation Model". The objective is to report accomplishments on TWOPAS model code upgrading and documentation and to document all TWOPAS model improvements.

United States Department of Transportation - Federal Highway Administration