Synthesis of Safety for Traffic Operations - Transports Canada

Synthesis of Safety for Traffic Operations March 2003
Vogt (1999)
Michigan and California
For four lane main roads, with stop-controlled two-lane minor roads and three approaches:
N = 0.000000192 ADT m 1.433 ADT s 0.269
exp(-0.0612M + 0.0560D)
where:
N = Number of crashes per year
ADT m = Average two-way major road traffic per day
ADT s = Average two-way side street traffic per day
M = Median width on the major road (metres)
D = Number of driveways on the major road within 76 metres of the intersection centre
For four lane main roads, with stop-controlled two-lane minor roads and four approaches:
N = 0.0000777 ADT m 0.850 ADT s 0.329
exp(0.110PL – 0.484L)
where:
N = Number of crashes per year
ADT m = Average two-way major road traffic per day
ADT s = Average two-way side street traffic per day
PL = Proportion of peak hour traffic approaching on the major road that is turning left (%)
L = 0 if major road has no left-turn lane; 1 if at least one left-turn lane.
For the signalized intersection of two-lane roads with four approaches:
N = 0.000955 ADT m 0.620 ADT s 0.395 exp(-0.0142PL s + 0.0315T) * exp( – 0.675L T + 0.130V)
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