PASSENGER CAR EQUIVALENTS (PCE) OF HETEROGENEOUS VEHICLES ON FOUR-LANE HIGHWAYS IN THAILAND
Keywords:Department of Highways, Four-lane highway, Passenger car equivalent, Lagging time headway, Highway gradient.
This paper is aimed to introduce Passenger Car Equivalent (PCE) values on four-lane highways in Thailand. The study began with a literature review of PCEs, and then 12 sections of four-lane highway were intentionally selected and data collected by using digital video cameras during 6:00 A.M. to 6:00 P.M. for two days for each site for a total of 12 sites. After that, the process involved decoding video signals from IP cameras to identify traffic volumes, speeds, and time headways for 13 different vehicle types. Next, the Lagging Time Headway (LTH) method was applied and analyzed to find PCE values in 15-minute intervals. The results showed that a highway gradient is a significant factor related to the PCE value. Moreover, the recommended PCE value of a four-lane highway according to the highway gradient was proposed in this study.
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