Impacts of Traffic Signal Installation at Marginally Warranted Intersections
University of Texas, Department of Civil Engineering, 1996 - Electronic traffic controls - 169 pages
This report documents the development of guidelines for the decision whether to install a traffic signal at a marginally warranted intersection. The recommendations are based on field and simulation studies of a number of intersections across Texas which were identified as marginally warranted by various Texas Department of Transportation (TxDOT) districts. The research included both delay and accident studies. The TEXAS simulation model was used for the delay studies. Eight different intersection geometries and twelve generic 24-hour volume patterns representing marginally warranted conditions were simulated.
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12 noon 2-Way All-Way Trafﬁc 52 Stopped 59 Stopped Delay 8A A A accident numbers Accidents by Severity actuated trafﬁc signals All-Way 9 all-way stop control All-Way Trafﬁc 2-Way approach speed AU-Way classiﬁed Difference not signiﬁcant ﬁgure Geometric 2-Way All-Way Hourly Volume identiﬁed Intersection 2-Way Stop intersection operation Leg 2 Leg Leg 4 Total level two-tailed test Low-Speed Rural Low-Speed Urban major street approaches marginally warranted intersections mh mh minor street noon 6 pm number of accidents Number of Stops OOH OOH Pattem Percent Change 2-Way Signal 16 Signal 20 Signal 9 Signal Stop Stop signalized intersections simulation studies statistically signiﬁcant Stop Signal Stop Stop Stop Signal Stopped Delay veh-hrs Stops Geometric 2-Way Stops Leg TEXAS Model Texas MUTCD Total Control minor Total Delay veh-hrs Traf Traffic Trafﬁc 2-Way All-Way Trafﬁc Case Stop trafﬁc engineer Trafﬁc Signal 17 Traﬂic unsignalized intersections veh/hour