A tandem intersection is an unconventional intersection design that possesses the important property of increasing the traffic capacity using pre‐signals and sorting areas. However, the operational efficiency of the lanes in the sorting areas may be affected by driver unfamiliarity and confusion. This study evaluates the effect of the tandem control on the saturation flow rate using field data. Statistical analyses were conducted to identify the difference in the saturation flow rate of the approach lanes when the tandem control was open and closed. A saturation flow rate adjustment model for tandem control was established in accordance with three factors: unequal distribution of traffic, red light violations at the pre‐signal, and incomplete discharge of vehicles at the sorting area. The results indicate that the tandem control decreases the saturation flow rate of the approach lanes in the sorting area. Most of the observed reductions are caused by the first factor, i.e. the unequal distribution of traffic. The other two factors, red light violations and incomplete discharge, can be controlled by using appropriate traffic signs, markings, and signal timing design.
Analysis of saturation flow rate at tandem intersections using field data
IET Intelligent Transport Systems ; 12 , 5 ; 394-403
2018-06-01
10 pages
Article (Journal)
Electronic Resource
English
field data , statistical analysis , traffic capacity , incomplete vehicle discharge , traffic markings , signal timing design , presignals , sorting areas , unequal traffic distribution , red light violations , tandem intersections , saturation flow rate analysis , road traffic control , saturation flow rate adjustment model , tandem control , lane operational efficiency , intelligent transportation systems , driver unfamiliarity , traffic signs , driver confusion
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