AN EVALUATION OF 8-PHASE SIGNAL CONTROL
A before-and-after study was undertaken by the Michigan Department of Transportation to assess accident experience and changes in travel time, stopped delay, fuel consumption, and vehicle emissions after changing from two-phase, fixed-time control to 8-phase, fully-actuated control at nine Michigan intersections. The intersections selected for 8-phase control were unique in that they were generally located at or near large regional shopping centers in a suburban setting. Variable and high left-turning volumes were present resulting in significant delays and a pattern of head-on, left-turn accidents for left-turning motorists. Total, property damage, and injury accidents and injuries decreased. Property damage accidents were reduced at six intersections, combined injury/fatal accidents were reduced at seven, and combined injuries/fatalities were reduced at eight. Left-turn, angle, and head-on accidents were decreased and rear-end accidents were increased. Property damage accident rates decreased at five intersections and combined injury/fatal accident rates decreased at eight. Tests of statistical significance are discussed in the text. NETSIM modelling of three intersections at a non-peak hour showed increases in travel time, stopped delay, fuel consumption, and vehicle emissions. (Author)
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Corporate Authors:
Michigan Department of Transportation
State Transportation Building, 425 West Ottawa Street, P.O. Box 30050
Lansing, MI United States 48909 -
Authors:
- Briglia Jr, P M
- Publication Date: 1981-11
Media Info
- Features: Appendices; Figures; Tables;
- Pagination: 31 p.
Subject/Index Terms
- TRT Terms: Actuated traffic signal controllers; Before and after studies; Crash rates; Crash severity; Exhaust gases; Fatalities; Fuel consumption; Injuries; Traffic actuated controllers; Traffic delays; Traffic signal controllers; Travel time
- Subject Areas: Energy; Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control;
Filing Info
- Accession Number: 00348738
- Record Type: Publication
- Report/Paper Numbers: TSD 486-81
- Files: TRIS, ATRI, STATEDOT
- Created Date: Jun 30 1982 12:00AM