- Visual lighting pro vertical illuminance calculation drivers#
- Visual lighting pro vertical illuminance calculation driver#
New design for intersection lighting layout for crosswalks.įigure 15. Traditional intersection lighting layout.įigure 14. New design for midblock crosswalk lighting layout.įigure 13. Traditional midblock crosswalk lighting layout.įigure 12. Vertical illuminance plot for a 250-W HPS flat lensĬobra-head-style luminaire mounted at 10 m (33 ft).įigure 11. Vertical illuminance plot for a 250-W HPS flat lensĬobra-head-style luminaire mounted at 8.5 m (28 ft)įigure 10. Visual background for a pedestrian at 61 m (200 ft) and at 305 m (1,000 ft) from a vehicle.įigure 9. Contrast of dark-clothed and light-clothed pedestrians.įigure 8. Luminance of a diffusely reflecting surface.įigure 5. Vertical illuminance ( E Vert) at a height of 1.5 m (5 ft).įigure 3. Vertical illuminance components.įigure 2. This document is available through the National Technical Information Service Springfield, VA 22161.įorm DOT F 1700.7 (8-72) Reproduction of completed page authorized.Ĭhapter 3-Crosswalk Lighting Design Considerationsįigure 1. Although the research was constrained to midblock placements of crosswalks, the report includes a brief discussion of considerations in lighting crosswalks colocated with intersections.Ĭrosswalk, midblock, lighting, lighting design, crosswalk lighting, vertical illuminance The research found that a vertical illuminance of 20 lx in the crosswalk, measured at a height of 1.5 m (5 ft) from the road surface, provided adequate detection distances in most circumstances. Two additional lighting systems, a Probeam luminaire and ground-installed LEDs, were also evaluated. Experimental condition variables included lamp type (high-pressure sodium and metal halide), vertical illuminance level, color of pedestrian clothing, position of the pedestrians and surrogates in the crosswalk, and the presence of glare.
Visual lighting pro vertical illuminance calculation driver#
The information is based on static and dynamic experiments of driver performance with regard to the detection of pedestrians and surrogates in midblock crosswalks. This report provides information on lighting parameters and design criteria that should be considered when installing fixed roadway lighting for midblock crosswalks. Office of Safety Research and DevelopmentĬontracting Officer's Technical Representative (COTR): Carl Andersen, HRDS-05 Gibbons, Chris Edwards, Brian Williams, and Carl K. Informational Report on Lighting Design for Midblock Crosswalks This report will be of interest to traffic engineers, lighting designers, and city, State, and local authorities with responsibility for public safety. The research documented in FHWA-HRT-08-052 (NTIS publication number PB2008-106431), consisting of both static and dynamic experiments of driver performance, found that a vertical illuminance level in the crosswalk of 20 lx, measured at a height of 1.5 m (5 ft) from the road surface, provided adequate detection distances for most midblock crosswalks.
Visual lighting pro vertical illuminance calculation drivers#
The following document summarizes the results of a series of studies that evaluated the visibility of pedestrians at nonintersection (midblock) crosswalks and provides information on lighting designs that will enhance the ability of drivers to detect those pedestrians. The program also promotes the cost-effective advancement of new practices and technologies to improve visibility. 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 visibility on and along roadways. PDF files can be viewed with the Acrobat® Reader®