Title

Collision Frequency Analysis Using Tree-Based Stratification

Document Type

Journal Article

Publication Date

2005

Subject Area

operations - traffic, operations - frequency, planning - safety/accidents, mode - rail

Keywords

Warning devices, Trees (Mathematics), Traffic safety, Speed limits, Railroad grade crossings, Mathematical models, Linear regression analysis, Linear regression, Level crossings, Highway railroad grade crossings, Highway rail intersections, Grade crossings, Crashes, Countermeasures, Collisions, Canada, Accident rates, Accident frequency

Abstract

Although several factors are known to contribute to collisions at highway-railway grade crossings, the mixed effects of the control factors such as a highway class and other countermeasures on collision occurrence are less well explored. This study evaluates the relationship between countermeasures and collision occurrence by using a sequential analytic strategy that combines the tree-based data stratification method with the generalized linear regression technique. After the control factor effects were controlled with the use of the tree-based data partitioning method, stratified collision prediction models were developed, and the adjusted effect of the selected countermeasures was identified. The conventional statistical models were also provided for comparison with stratified models. The study used Canadian inventory and collision data to demonstrate the expected collision reductions resulting from changes in selected countermeasures, such as warning devices and posted speed limit.