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Traffic and Road Safety (TARS) Research Group
Project index
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Road Design
Reducing intersection visibility to reduce speeds
2001-2002
Transit/LTSA Crash Reduction Team |
Busy intersection of two state highways. Twenty-four crashes at the site in five years (1995 through 1999)
Asymmetric pattern of crashes: 91% of crashes from the east-bound approach
Human factors analysis of driver behaviour at the intersection (employing SITE technique) suggested anticipatory decision-making by eastbound drivers.
Recommended restricting clear sight at intersection approach to delay driver decisions until they reached the intersection
Treatment consisted of 30% knitted shade cloth 2.1 m in height, beginning 125 m prior to intersection and ending 25 m prior to intersection
Produced a 23.4% reduction in the 80th percentile approach speeds. 10.95 km/h reduction in 85% percentile speeds (from 49.95 to 39 km/h). Elimination of all approach speeds over 57 km/h. Treatment has remained effective 4 years later.
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Charlton, S.G. (2003). Restricting intersection visibility to reduce approach speeds.
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