Estimation of conflicting traffic volume using spatiotemporal factor

Abstract

Conflict traffic volume is one of the crucial parameters for U-turn capacity estimation at the mid-block median opening (MBMO). Therefore, the present study is undertaken for the estimation of conflicting traffic volumes at MBMO. In this regard, a simple yet practical methodology has been proposed, and a parameter named spatiotemporal conflicting factor has been introduced. In order to estimate spatial conflicting factor, the entire carriageway-width was divided into two zones namely, spatial conflict zone and spatial no-conflict zone. Spatial conflicting factor was estimated by studying the placement characteristics of approaching through traffic and U-turning traffic. Subsequently, temporal conflicting factor was estimated based on no-conflict time gap and possible slowdown section. Afterward, spatiotemporal conflicting factor and resulted conflicting traffic volume was estimated for MBMO in 6-lane and 4-lane road. The present investigation's tangible outcome is to estimate the realistic capacity values of median openings, which will be beneficial for traffic planners for efficient management of traffic for an improved level of service and safety.

Realistic Approach for Capacity Estimation of U-Turns Under Heterogeneous Traffic Condition

“…Operations at MBMOs are more complex compared with signalized intersections where signals are installed for guiding the traffic whereas no such arrangements are available at MBMOs. Moreover, in India, most MBMO locations are not controlled by traffic police nor are yield signs provided, and even if in some places signs are provided, drivers with unruly driving behavior tend not to follow them (4)(5)(6)(7). Therefore, estimation of capacity of an MBMO is an important task to evaluate its performance under prevailing conditions.…”

Identification of Spatial and Temporal Dilemma Zone at Mid-Block Median Openings: A Gap Acceptance Based Approach

“…The mid-block median opening (MBMO) is a location provided in the raised median to enable U-turns and to allow vehicles to merge with the approaching through traffic (ATT) stream. The MBMO is a location where traffic operation relies entirely on the driver’s perception, making it very similar to an uncontrolled intersection ( 8 , 9 ). U-turning vehicles tend to make aggressive and risky turns, forcing the ATT to reduce its speed so that they can complete the U-turn ( 10 , 11 ).…”