LIGHTS AND LIGHTING FOR HAZARD WARNING AND DELINEATION
Hazard Warning Study - In a laboratory study 24 observers, 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 6 and 12-v lamps, wherein observers were required to compare these lights at varying flash rates. It was found that a flash rate of between 95 and 105 flashes per minute, with an approximately 20 percent 'on time,' was preferred, with an effective intensity of a least 20 to 40 candela for a 1,000-ft warning distance. Delineation Lighting Study - In a laboratory study with 108 observers, and a field study using 20 observers, steady-burning lights proved distinctly superior to various types of flashing light delineation systems. For best delineation, the left and right rows of lights should be different colors.
- Study was aided by DOT, Federal Highway Administration.
Michigan Department of State Highways & TransportTesting and Research Division
Lansing, MI United States 48904
- Janson, M H
- Publication Date: 1976-10
- Pagination: 97 p.
- TRT Terms: Field studies; Flashing traffic signals; Hazard markings; Highway delineators; Lighting; Simulation; Vision; Yellow interval (Traffic signal cycle)
- Uncontrolled Terms: Flashing yellow signals
- Old TRIS Terms: Delineators (Traffic)
- Subject Areas: Highways; Safety and Human Factors;
- Accession Number: 00158098
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: FHWA-M1-76-928
- Contract Numbers: R-928
- Files: TRIS, USDOT, STATEDOT
- Created Date: Oct 13 1977 12:00AM