2025 Volume 11 Issue 4 Pages A_17-A_24
The study examined the sustained effectiveness of Pace-Maker-Light (PML) on interurban expressways by comparing traffic capacity before and immediately after the implementation, up to three years after the implementation. The traffic capacity increased immediately after the implementation and decreased with each passing year until the following three years. However, the traffic capacity obtained from this study demonstrated a lesser decrease in traffic capacity over time than was observed before the measures were implemented. This finding suggests that the sustained effectiveness of PML measures is greater than the secular decrease of traffic capacity. In addition, while the congestion measure in the transverse direction in the previous study, which aimed to equalize a lane utilization, resulted in a sustained increase in the traffic capacity, the measure in the longitudinal direction in this study, which encouraged vehicles to adjust their speed, was not found to be effective enough to sustain an increase in traffic capacity.
