Capacity Analysis of 10 Toll Plazas on the OOCEA Network

M.L. Zarrillo (USA)


Traffic Modelling, Tolls, Electronic Toll Collection


This study uses the hourly throughput queuing model, SHAKER, to quantitatively evaluate the performances of real plaza lane configuration patterns. Plaza lane configurations and data concerning the characteristics of the approaching traffic were collected during a typical day for ten toll facilities maintained by the Orlando Orange County Expressway Authority, OOCEA. The twenty unidirectional lane configuration patterns of the 10 plazas on November 5, 2002, are evaluated for performance using a new measure of effectiveness, the No Queue-Maximum-Throughput, NQMT. Plaza capacity was found to depend heavily on the approaching traffic characteristics, specifically, how well it matched up with the plaza’s lane configuration. Frequently, for instance, the computed NQMT values were low whenever the percentage was high for the approaching traffic that belonged to the category consisting of trucks using the manual collection service. If there are not enough lanes dedicated to this category of traffic, queues could begin to grow. In addition, the computed NQMT values were often high whenever the percentage was high for the approaching traffic that were electronic toll collection users.

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