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Turner-Fairbank Highway Research Center

 
 
 
 
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Safety Evaluation of Corner Clearance at Signalized Intersections

Product Type

Research Report

Author

Thanh Le, Frank Gross, Tim Harmon, and Kimberly Eccles

Date

Feb-18

Abstract

This study evaluates corner clearance at signalized intersections under the Development of Crash Modification Factors program for the Evaluation of Low-Cost Safety Improvements Pooled Fund Study. Geometric, traffic, and crash data were obtained for signalized intersections with various corner clearances from the State of California and the City of Charlotte, North Carolina. A cross-sectional analysis was conducted to estimate the effects of corner clearance while controlling for other differences among study sites. The estimated CMFs indicated that more limited clearance (i.e., driveway(s) within 50 ft of the signalized intersection) on receiving corners was associated with increases for all crash types, based on the data included in this analysis. These increases were statistically significant at the 90-percent level or greater for total, fatal and injury, rear-end, sideswipe, right-angle, and nighttime crashes. Only the results for turning crashes were not statistically significant at the 90-percent level. For limited corner clearance on the approach corners, the results indicated statistically significant reductions in total, fatal and injury, and rear-end crashes. The results also indicated reductions in sideswipe and nighttime crashes, and increases in right-angle and turning crashes, but none of these results were statistically significant at the 90-percent level.

Link To Research Report

Safety Evaluation of Corner Clearance at Signalized Intersections

Keywords

Corner clearance
signal
intersection
low-cost
safety improvements
safety evaluations
access management
driveways


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HSIS Summaries

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