Study Details
Study Title: Collision Frequency Analysis Using Tree-Based Stratification
Authors: Park, Y.-J. and Saccomanno, F.F.
Publication Date: 2005
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.
Study Citation: Park, Y.-J. and Saccomanno, F.F., "Collision Frequency Analysis Using Tree-Based Stratification", Transportation Research Record 1908, pp. 121-129, 2005.
CMFs Associated With This Study
Category: Railroad grade crossings
Countermeasure: Installing gates at crossings with signs
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.06 | 94 |  | All | All | Minor Arterial | Not specified |
| 0.13 | 87 |  | All | All | Local | Not specified |
| 0.09 | 91 | | All | All | Local | Not specified |
| 0.34 | 66 | | All | All | Not specified | Not specified |
Countermeasure: Upgrade signs to flashing lights
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.22 | 78 | | All | All | Minor Arterial | Not specified |
| 0.31 | 69 | | All | All | Local | Not specified |
| 0.21 | 79 | | All | All | Local | Not specified |
| 0.26 | 74 | | All | All | Not specified | Not specified |
