A safety study will be conducted at a divided rural multilane roadway segment. For the data given below, determine: i. The total estimated average crash frequency on the segment ii. The fatal-and-injury average estimated crash frequency on the segment iii. The overdispersion parameters for (i) and (ii)
Data:
Length of road segment = 8450 ft
AADT = 6750 veh/day
Lane width = 12 ft
Shoulder width = 8 ft
Median width = 30 ft
No lighting
No automated speed enforcement
Possible injury crashes are not included
What will be an ideal response?
a) Determine the predicted number of total crashes
For divided rural multilane roadway segments, use Equation 5.19 (Table 5.16), coefficients from Table 5.19:
b) Determine the predicted number of fatal-and-injury crashes
Use Equation 5.19, coefficients from Table 5.19:
c) Determine the overdispersion parameter for (i)
From Table 5.16, coefficient from Table 5.19:
d) Determine the overdispersion parameter for (ii)
From Table 5.16, coefficient from Table 5.19:
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