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 ...
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, ...
Work Zone Lighting’s Effect on Driver Visibility
(National Surface Transportation Safety Center for Excellence, 2019-06-05)
Portable light towers are a significant source of glare to motorists entering a work zone. Although existing research has evaluated the effect of light tower orientation on visibility and glare, the effects of factors like ...
(National Surface Transportation Safety Center for Excellence (NSTSCE), 2017-02-28)
Under the sponsorship of the National Surface Transportation Safety Center for Excellence (NSTSCE), a research team at the Virginia Tech Transportation Institute (VTTI) developed a color camera system that can collect ...
Development of a Mobile Measurement System for Roadway Lighting
(National Surface Transportation Safety Center for Excellence, 2018-01-04)
In recent years, the complexity of the evaluation metrics of roadway lighting has continually increased. In order to measure the effectiveness of a roadway lighting system in situ, a mobile measurement system has been ...
Examination of the Current Practice of Lighting in Virginia: Nighttime Work Zones and Improving Safety Through the Development of Nighttime Lighting Specifications
(Virginia Transportation Research Council, 2017-09)
This project evaluated current nighttime work zone lighting practices for limited-access highways and primary routes in Virginia through (1) an on-site evaluation of lighting levels in work zones; (2) an illuminance ...
Rural Intersection Lighting Safety Analysis
(National Surface Transportation Safety Center for Excellence, 2017-08-03)
Under the sponsorship of the National Surface Transportation Safety Center for Excellence (NSTSCE), this research studied the relationship between lighting level and the night-to-day (ND) crash ratio at rural intersections ...
Effect of Intersection Lighting Design on Drivers' Perceived Visibility and Glare
A systems-level approach to intersection lighting design has shown that illuminating the intersection box increases drivers’ nighttime visual performance. However, for an intersection lighting design to be effective and ...