Study Details
Study Title: Rectangular Rumble Strip Safety Evaluation
Authors: Storm et al.
Publication Date:APR, 2020
Abstract: This evaluation determined the change in crash frequency, type or severity associated with longitudinal rectangular rumble strips on rural two-lane undivided and rural four-lane divided Minnesota roadways constructed between 2012 and 2018. Crash Modification Factors (CMFs) were estimated using cross-sectional analysis to compare crash experience of locations with (i.e., centerline only, centerline + shoulder, or shoulder only) and without rectangular rumble strips. The cross-sectional analysis matched sites with and without rumble strips using matched-pair comparisons. Negative Binomial (NB) or Poisson log-linear regression models were used to model the crashes at all treatment and non-treatment sites. There was a total of approximately 1,200 miles of treated (i.e., centerline only, centerline + shoulder, or shoulder only) and untreated sites on rural two-lane roads and approximately 35 miles of treated (i.e., shoulder rumble strips) and untreated sites on rural four-lane divided roads. On rural two-lane undivided roads, the CMF for centerline + shoulder rumble strips was 0.73 for all crashes; shoulder only rumble strips had a CMF of 0.68 for all crashes. For single vehicle run-off-the-road crashes on rural two-lane highways, the CMF for rumble strips on the centerline + shoulder was 0.68; the CMF for shoulder only rumble strips was 0.76. The CMF for head-on, or opposite direction sideswipe crashes on rural two-lane roads with centerline and shoulder rumble strips was 0.64. On rural four-lane divided roads, the CMF for shoulder rumble strips for all crashes was 0.66 and 0.40 for single vehicle run-off-the-road crashes.
Study Citation: Storm, R., S. Klump, O. Kosta, M. Raad, and E. Wemple. "Rectangular Rumble Strip Safety Evaluation." Report No. MN 2020-07. Minnesota Department of Transportation. Roseville, Minnesota. (April 2020).
CMFs Associated With This Study
Category: Roadway
Countermeasure: Install centerline and shoulder rumble strips
CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
---|---|---|---|---|---|---|
0.73 | 27 | All | All | All | Rural |
0.68 | 32 | Other | All | All | Rural |
0.64 | 36 | Other | All | All | Rural |
Category:Shoulder treatments
Countermeasure: Install shoulder rumble strips
CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
---|---|---|---|---|---|---|
0.68 | 32 | All | All | All | Rural |
0.76 | 24 | Other | All | All | Rural |
0.66 | 34 | All | All | All | Rural |
0.4 | 60 | Other | All | All | Rural |