DefinePK

Abstract

Heavy vehicles (HVs) are often considered as a hindrance in traffic flow especially at toll roads. Besides their large dimensions and slow movement, HVs also disrupt the traffic flow due to their indiscipline in using the lane that is designated to them. The aims of this study are to conduct a 24-hour traffic flow video recording data which divided into compliance and non-compliance state and to analyze the impact of HV drivers’ indiscipline in using the HV lane on the traffic performance at Jakarta Outer Ring Road (JORR). By using the regression mathematical model, the traffic flow models of both states were generated to determine the impact of HV discipline on the traffic performance. The analysis shows that the frequency of HV indiscipline’s during observation time is more than 70% of respondents. However, it turns out that the traffic in the non - compliance state is better due to the efficient space utilization. However, at very low density, the indiscipline does not affect the speed, but as the density increased, the speed of the non-compliance state is also increased by 28%. The actual road capacity of non-compliance state is also 17.5% greater than the one with compliance state. The efficiency of space utilization is also indicated by the higher jam density of non-compliance state for about 20.24%. In the current condition at JORR’s, the density of vehicles is high for almost day time where the regulation concerning the HV lane restrictions becomes ineffective in improving the overall traffic performance. It is suggested to implement the access restriction for HVs during the day time only.