Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 5, Problem 19P
To determine
(a)
The appropriate countermeasures while establishing crash reduction factors.
To determine
(b)
The expected reduction in crashes per year after implementation of the countermeasures.
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The state transportation agency has established crash
reduction factors shown in the table. An intersection has
been identified as having an abnormally high left turn crash
rate (17, 20, and 18 crashes in the last three years),
attributed to excessive speeds and the absence of an
exclusive left-turn phase. The ADT of the intersection for
the last three years is 8,400, and the ADT for after
implementation is 9,500. Determine (a) the appropriate
countermeasures and (b) the expected reduction in crashes
if the countermeasures are implemented. .
Countermeasure
Crash Reduction Factor
Retime Signals
0.10
Provide left-turn signal phase 0.30
Reduce speed limit on
approaches
0.35
Provide turning guide lines
0.05
Prohibit left turns
0.75
22. An intersection had 25 reported traffic crashes during the months of January through
September. The AADT for the intersection is shown. What is the crash rate per million entering
vehicles
2000
8000
4000
A proposed improvement will widen a two-lane rural highway from 9-ft-wide (per lane) to 11-ft-wide (per lane) if the highway has an AADT of 2100 veh/day. If there are an average of 25 crashes per year on the segment proposed for improvement, and 67% of the crashes are of the type targeted by the improvement, estimate the expected number of crashes (per year) after the improvement is constructed.
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Traffic And Highway Engineering
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