Question

In: Civil Engineering

A two-lane rural highway, four-leg intersection will have its stop control replaced by a signal control....

A two-lane rural highway, four-leg intersection will have its stop control replaced by a signal control. Compute the expected average total crash frequency (all types, all severities) after the change for the following conditions:  

Expected average crash frequency before change: 23 total crashes/yr
AADT on minor road: 1500 veh/day 
AADT on major road: 5000 veh/day  

Please show all work and formulas used. Thanks! Submitting this again this the last person didn't even answer the question at all. Not sure what they were reading.

Expert Solution

This problem will be solved in two steps

Step 1 : Determination of crash modification factor (CMF) while converting from stop control to signal control

Treatment	Setting (intersection type)	Traffic volume AADT(Veh/day)	Crash type (all severities)	CMF
Install a traffic signal	Urban (four leg; Major road speed limit is 65kmph)	Unspecified	All types	0.95
			Right-Angle	0.33
			Rear-end	2.43
	Rural (3 leg and 4 leg)	Major roads (3261-29926) Minor roads (101-10300)	All types	0.56
			Right angle	0.23
			Left-Turn	0.40
			Rear-end	1.58

Given; Rural 4 lane way with

AADT on major road = 5000 veh/day

AADT on minor road = 1500 Veh/day with all types and all severities

Therefore from above table;

CMF = 0.56

Step 2: Determining crash frequency after replacing

Crash frequency after replacing = CMF * Average crash frequency before replacing

Given; Average crash frequency before replacing = 23/year

crash frequency after replacing = 0.56 * 23 = 12.88/year

Therefore Total crash frequency after change = 12.88 crashes/year

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Ally Wells answered 1 year ago

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