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Publication Detail
RP NCTS 1998-03: Study on the Effects of Gap Forcing at Two-Way-Stop-Controlled Intersections Using Simulations

Most methods involving the estimation of capacities and delays of unsignalized intersections are based on Simple Gap Acceptance a method, which assumes that the minor streams do not affect major streams. This means that in a simple two-stream case the major stream cannot experience any delay while the minor stream have to evaluate first the gaps available in the major stream before it can depart. In this study, a simulation program is used to eliminate the usual problems encountered while doing actual surveys on capacities and delays of unsignalized intersection. The program takes into account the gap forcing that is common among drivers and examines its effects not only on the minor stream but the on major stream as well. A comparison between simulated data and the observed data using t-test shows that the actual data can be predicted using the simulation program. The program is then used to examine the behaviors of delays and capacities by varying the inputs of the following parameters; follow-on-time, and the number of left turns both from the minor and major legs. The author found out that capacities and delays are highly affected by these parameters that led to some important discussions on issues relating to delay and capacity estimation methods and warrants used for signalization.

UP-National Center for Transportation Studies
Authors Keywords
Ladaga, Alex S.; economic/development modelling; econometric modeling; road; transportation; road traffic;
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