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Estimating Benefits from Specific Highway Safety Improvements: Phase Iii, Safety Benefits from Left Turn Treatment
| Content Provider | Semantic Scholar |
|---|---|
| Author | Garrick, Norman W. Ivan, John N. Rimiller, J. |
| Copyright Year | 2003 |
| Abstract | Sixteen Connecticut intersections which have recently had left turn lanes installed were selected for study. The objective of this project is to quantify the benefits of such treatment. The study is based on an Empirical Bayesian model, in order to mitigate the effects of regression to mean. Comparison sites with similar geometric characteristics, control types, and land uses to the study sites were selected. Data from the comparison intersections were used to estimate what the crash rates during the post-treatment period would have been, had no treatment taken place. These crash rates are then compared to the actual crash rates of the treated intersections. The comparison shows that the regression to mean bias is minimal and therefore the simpler before and after analysis may be preferable. Safety benefits of left turn lanes were also analyzed. Left turn lane installation appears to have had varying effects on different crash types. The effects of control type, number of lanes, and number of legs on the success of a left turn lane were studied. Finally, a severity analysis was performed. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://docs.trb.org/00941259.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
