Lights and Lighting for Hazard/Warning and Delineation.

摘要

In a laboratory study 24observers,representing a cross-section of driver ages,were asked to respond to a flashing yellow light,presented to scale in a simulated roadway setting amongst various other lights;both flashing and steady-burning. A field study was also conducted using both 6and 12-v lamps,wherein observers were required to compare these lights at varying flash rates. It was found that a flash rate of between 95and 105flashes per minute,with an approximately 20percent 'on time,'was preferred,with an effective intensity of at least 20to 40 candela for a 1,000-ft warning distance. In a laboratory study with 108observers,and a field study using 20observers,steady-burning lights were compared with various types of flashing light delineation systems. For best delineation,different colors were recommended for the left and right rows of lights.