Now showing items 1-10 of 38
Applicability of mesopic factors to the driving task
With the advent of light-emitting diode technology being applied to roadway lighting, the spectral power distribution of the light source is becoming much more important. In this experiment, the detection of pedestrians ...
Development and validation of a luminance camera: final report
(Virginia Tech. Virginia Tech Transportation Institute, 2009-02-11)
Under the sponsorship of the National Surface Transportation Safety Center for Excellence (NSTSCE), an effort was undertaken to develop a system of image capture to analyze luminance data gathered in naturalistic driving research.
Luminance metrics for roadway lighting
(Virginia Tech. Virginia Tech Transportation Institute, 2011-03-25)
The focus of the current study is the comparison of multiple contrast metrics... The images of pedestrians from a previous nighttime research study were used for analysis. The pedestrians were clothed in both denim and ...
Enhanced Night Visibility Series, Volume I: Executive Summary
(United States. Federal Highway Administration, 2005-12)
This volume, an executive summary of the Enhanced Night Visibility project, is the first of 18 volumes that report on the project's evaluation of the merit of implementing supplemental ultraviolet headlamps, supplemental ...
Enhanced Camera/Video Imaging Systems (E-C/VISs) for Heavy Vehicles
(United States. National Highway Traffic Safety Administration, 2011-06)
Tests were performed to determine the feasibility of developing an Enhanced Camera/Video Imaging System (Enhanced C/VIS or E-C/VIS) to provide heavy-vehicle drivers with better situation awareness to the sides and rear of ...
Assessment of the Durability of Wet Night Visible Pavement Markings: Wet Visibility Project Phase IV
(Virginia Center for Transportation Innovation and Research, 2012-06)
This project encompassed a research effort to establish the durability of pavement markings in an on-road installation. Six marking technologies were installed on a portion of Route 460 in Blacksburg, Virginia. A human ...
The Assessment of Alternative Overhead Sign Lighting
(National Surface Transportation Safety Center for Excellence, 2020-07-22)
This report evaluates an alternative method for lighting highway signs that takes advantage of their retroreflective properties. This method uses a single luminaire mounted some distance upstream of the sign, with a focused, ...
Active and Adaptive Roadway Delineation Systems
(National Surface Transportation Safety Center for Excellence, 2017-10-13)
Heavy fog presents a significant safety hazard to drivers by reducing their ability to see the roadway and other vehicles. Even so, drivers often fail to adjust their speed to account for the reduced visibility, resulting ...
Wet night visibility of pavement markings :executive summary
(Virginia Center for Transportation Innovation and Research, 2004-10)
This executive summary describes an investigation into the performance of pavement markings in wet night conditions. The performance of a typical pavement marking will degrade when it gets wet. This is a result of the ...
Light Levels for Parking Facilities Based on Empirical Evaluation of Visual Performance and User Perceptions
(Taylor & Francis, 2020-04-02)
Light levels recommended for parking facilities should be backed by empirical research that accounts for all users. In the current study, pedestrians’ and drivers’ visual performance and their perceptions of safety, comfort, ...