Abstract
The delay function is a central component of equilibrium trip assignment models that influences the traffic volume on a road section. The Volume Delay Function (VDF) developed by US Bureau of Public Roads (BPR) in 1964 is commonly used to iterate traffic volume in Indonesia despite the fact that the Indonesian Highway Capacity Manual (MKJI) also has a curve of the VDF describing delay in Indonesia. This paper attempts to obtain the delay equation and its parameters refer to the curve of MKJI VDF. This is followed by an implementation using field data is carried out to compare traffic volume produced using the BPR VDF and the MKJI VDF. The results show that the application of the MKJI VDF can obtain a more accurate representation of the actual traffic volume compared to the BPR VDF.
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