This study takes the initiative and evaluates the safety effectiveness of RCUTs in reducing rear-end and angle crash types in the state of Kentucky using the empirical Bayes (EB) before-and-after approach. The focus is explicitly on these two crash types due to their strong association with severe and injury-related crashes at intersections. In this regard, a total of 19 RCUT sites were selected for the safety evaluation. Crash data were retrieved from the Kentucky Transportation Cabinet (KYTC) in each of the before-and-after periods. The influence area considered for analyzing the before-period included crashes within a 250 ft (radius) circular buffer zone from the centroid of the intersection. To collect the after-period crashes for RCUT intersections, 250 ft (radius) circular buffer from the center of the main intersection and 50-ft (radius) circular buffer from the center of each median U-turn were considered. Additional effort was made to collect the operational and geometric attributes (e.g., annual average daily traffic “AADT,” shoulder width, and median width) manually at each RCUT location for developing crash prediction models in the before period (i.e., before conversions from traditional intersections to RCUTs). Crash data exhibited over-dispersion; hence, the negative binomial (NB) model was employed to develop the safety performance functions (SPFs) for the two crash types (i.e., rear-end and angle crashes). To evaluate the safety effectiveness of RCUTs, the EB method was employed, which suggested that the conversion of traditional intersections into RCUTs showed a significant angle crash reduction of 33.8% at the 5% significance level, as well as a significant rear-end crash reduction of 75% at the 5% significance level.
Evaluating Restricted Crossing U-Turn (RCUT) Intersections on Reducing Rear-End and Angle Crashes
International Conference on Transportation and Development 2025 ; 2025 ; Glendale, Arizona
05.06.2025
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Developing Signal Warrants for Restricted Crossing U-Turn Intersections
Transportation Research Record | 2021
|Algorithms for avoiding automotive crashes at left and right turn intersections
Europäisches Patentamt | 2017
|ALGORITHMS FOR AVOIDING AUTOMOTIVE CRASHES AT LEFT AND RIGHT TURN INTERSECTIONS
Europäisches Patentamt | 2017
|