ACtrafficengr
Civil/Environmental
- Jan 5, 2002
- 1,641
Looking at the literature available on-line, I haven't been able to find a crash reduction factor for changing from permitted/protected left turns to protected only phasing.
The closest I could find was from Kentucky, which listed CRF's for going from no left turn phasing to protected/permitted (10% overall, 40% left turn crashes), and going from no left turn phasing to protected only (20% overall, 70% left turn crashes).
Then again, NCHRP 500v12 states "a consensus on the extent of this effectiveness has not been reached," so should I just fall back and punt?
"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail." - Wm. Phelps Eno, ca. 1928
"I'm searching for the questions, so my answers will make sense." - Stephen Brust
The closest I could find was from Kentucky, which listed CRF's for going from no left turn phasing to protected/permitted (10% overall, 40% left turn crashes), and going from no left turn phasing to protected only (20% overall, 70% left turn crashes).
Then again, NCHRP 500v12 states "a consensus on the extent of this effectiveness has not been reached," so should I just fall back and punt?
"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail." - Wm. Phelps Eno, ca. 1928
"I'm searching for the questions, so my answers will make sense." - Stephen Brust
