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.

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.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Highway Safety

Proper highway safety refers to the methods or rules that prevent highway travelers from being killed or severely injured. Proper highway safety measures help to protect motorists, cyclists, pedestrians, passengers on public transport, and so on.

Question

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

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