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U.S. Department of Transportation
Federal Highway Administration
Research, Development, and Technology
Turner-Fairbank Highway Research Center
6300 Georgetown Pike
McLean, VA 22101-2296
The overall goal of the Federal Highway Administration's (FHWA) Visibility Research Program is to enhance the safety of road users through near-term improvements of the visibility on and along the roadway. The program also promotes the advancement of new practices and technologies to improve visibility on a cost-effective basis.
The following document provides an overview of the initial series of studies conducted in Phase I of the Enhanced Night Visibility (ENV) project, and the development of the Phase II plan for the experiment. The ENV project provided a comprehensive evaluation of evolving and proposed headlamp technologies in various weather conditions. The individual studies within the overall project are documented in an 18-volume series of FHWA reports, of which this is Volume II. It is anticipated that the reader will select those volumes that provide information of specific interest.
This report will be of interest to headlamp designers, automobile manufacturers and consumers, third-party headlamp manufacturers, human factors engineers, and people involved in headlamp and roadway specifications.
Michael F. Trentacoste |
This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document.
The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names appear in this report only because they are considered essential to the objective of the document.
The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.
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Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
This volume is the second of 18 volumes in this research report series. Each volume is a different study or summary, and any reference to a report volume in this series will be referenced in the text as “ENV Volume I,” “ENV Volume II,” and so forth. A list of the report volumes follows:
Volume | Title | Report Number |
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I | Enhanced Night Visibility Series: Executive Summary | FHWA-HRT-04-132 |
II | Enhanced Night Visibility Series: Overview of Phase I and Development of Phase II Experimental Plan |
FHWA-HRT-04-133 |
III | Enhanced Night Visibility Series: Phase II—Study 1: Visual Performance During Nighttime Driving in Clear Weather |
FHWA-HRT-04-134 |
IV | Enhanced Night Visibility Series: Phase II—Study 2: Visual Performance During Nighttime Driving in Rain |
FHWA-HRT-04-135 |
V | Enhanced Night Visibility Series: Phase II—Study 3: Visual Performance During Nighttime Driving in Snow |
FHWA-HRT-04-136 |
VI | Enhanced Night Visibility Series: Phase II—Study 4: Visual Performance During Nighttime Driving in Fog |
FHWA-HRT-04-137 |
VII | Enhanced Night Visibility Series: Phase II—Study 5: Evaluation of Discomfort Glare During Nighttime Driving in Clear Weather |
FHWA-HRT-04-138 |
VIII | Enhanced Night Visibility Series: Phase II—Study 6: Detection of Pavement Markings During Nighttime Driving in Clear Weather |
FHWA-HRT-04-139 |
IX | Enhanced Night Visibility Series: Phase II—Characterization of Experimental Objects |
FHWA-HRT-04-140 |
X | Enhanced Night Visibility Series: Phase II—Visual Performance Simulation Software for Objects and Traffic Control Devices |
FHWA-HRT-04-141 |
XI | Enhanced Night Visibility Series: Phase II—Cost-Benefit Analysis | FHWA-HRT-04-142 |
XII | Enhanced Night Visibility Series: Overview of Phase II and Development of Phase III Experimental Plan |
FHWA-HRT-04-143 |
XIII | Enhanced Night Visibility Series: Phase III—Study 1: Comparison of Near Infrared, Far Infrared, High Intensity Discharge, and Halogen Headlamps on Object Detection in Nighttime Clear Weather |
FHWA-HRT-04-144 |
XIV | Enhanced Night Visibility Series: Phase III—Study 2: Comparison of Near Infrared, Far Infrared, and Halogen Headlamps on Object Detection in Nighttime Rain |
FHWA-HRT-04-145 |
XV | Enhanced Night Visibility Series: Phase III—Study 3: Influence of Beam Characteristics on Discomfort and Disability Glare |
FHWA-HRT-04-146 |
XVI | Enhanced Night Visibility Series: Phase III—Characterization of Experimental Objects |
FHWA-HRT-04-147 |
XVII | Enhanced Night Visibility Series: Phases II and III— Characterization of Experimental Vision Enhancement Systems |
FHWA-HRT-04-148 |
XVIII | Enhanced Night Visibility Series: Overview of Phase III | FHWA-HRT-04-149 |