Study Details
Study Title: An Empirical Bayes Model to Assess Deer-Vehicle Crash Safety in Urban Areas in Iowa
Authors: Baird et al.
Publication Date:JAN, 2011
Abstract: Deer-vehicle crashes are a growing problem in Iowa. In 2008, deer-vehicle crashes represented 12% of all crashes reported and included 9 fatalities and 442 injuries. These crashes are especially problematic in urban areas of Iowa, where the prevalence of deer-vehicle crashes is becoming a more visible issue. Quite a bit of research has been conducted on countermeasure action that could help mitigate deer-vehicle crashes. However, little previous work has attempted to model deer-vehicle crashes in urban areas using the two data sources available: deer carcass salvage reports and deer-vehicle crash reports. The objective of this paper is to assess the safety of roadway segments in three cities with long-running deer management programs using both deer-vehicle crash and deer carcass salvage data. The authors reconciled records to help eliminate double counting and estimated count data models to examine deer-vehicle crash frequency as a function of roadway and environmental factors. The count model estimates were used in an empirical Bayes model to predict deer-vehicle crashes in the select urban areas of Iowa. This model can be used to help allocate safety funds to implement appropriate deer-vehicle crash countermeasures in high-risk locations.
Study Citation: Baird, M., Gkritza, K., Souleyrette, R., and Danielson, B., "An Empirical Bayes Model to Assess Deer-Vehicle Crash Safety in Urban Areas in Iowa." Presented at the 90th Meeting of the Transportation Research Board, Washington, D.C., (2011).
CMFs Associated With This Study
Category: Roadside
Countermeasure: Presence of grass land use
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.95 | -95.4 |  | All | All | Principal Arterial Other Freeways and Expressways | Urban |
Category:Roadway
Countermeasure: Presence of two-lane roadway vs. greater than two-lane roadway
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.43 | 57.2 | | All | All | Principal Arterial Other Freeways and Expressways | Urban |
Category:Shoulder treatments
Countermeasure: Gravel right shoulder
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 4.21 | -321.2 | | All | All | Principal Arterial Other Freeways and Expressways | Urban |
Category:Speed management
Countermeasure: Implement speed limit of 50 mph or greater
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 2.27 | -127 | | All | All | Principal Arterial Other Freeways and Expressways | Urban |
