Estimation of Dynamic Value of Passenger Car Unit in the Mixed Traffic

Abstract

The concept of the homogeneous vehicle equivalent number was widely known in the capacity analysis in macroscopic perspective. The term of Passenger Car Unit (PCU) is generally used in the mixed traffic, which consists of two types of traffic; cars and motorcycles. In Indonesian Highway capacity manual, traffic is classified into three categories: motorcycle, light vehicle, and heavy vehicle with static PCU values. On the other hand, the concept of Dynamic Passenger Car Unit (DPCU) with two types of traffic is established in the present study. The value of DPCU is changed dynamically by traffic states determined by speed, flow and the composition of traffic. The variation of DPCU value is modeled by using these parameters. Then, the model is applied to the actual traffic. As a result, it is shown that DPCU can describe the relationship between Flow and Density with fewer variations comparing to static PCU.