U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590

Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration

Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-04-135
Date: December 2005

Enhanced Night Visibility, Volume IV: Phase II—Study 2: Visual Performance During Nighttime Driving in Rain

PDF Version (1.61 MB)

PDF files can be viewed with the Acrobat® Reader®


Study 2 in Phase II of the Enhanced Night Visibility (ENV) project was the first in a series of three studies conducted at the Virginia Smart Road testing facility that focused on drivers’ visual performance during adverse weather conditions (i.e., rain, snow, and fog). The experimental tasks for this study consisted of driving at nighttime in rainy conditions using 12 different vision enhancement system (VES) configurations (the same set used for Phase II, Study 1; see ENV Volume III). Drivers’ visual performance was evaluated in terms of detection and recognition distances for different objects while using the different VESs. Subjective performance ratings were garnered from questionnaires administered to participants following the use of each VES.

The driving portion of the study took place at the Smart Road testing facility. The road was closed to all traffic except for experimental vehicles, of which there were no more than two on the road at any time. Participants underwent a one-night training session on the night before their two nights of participation in the onroad study. The following chapter describes the methodology for Study 2.


Table of Contents       Next
United States Department of Transportation - Federal Highway Administration