c) The Zambian Road Transport and Safety Agency (RTSA) has established crash reduction factors shown in the table below. CountermeasSure Reduction Factor Retime signals Provide left-turn signal phase Reduce speed limit on approaches Provide turning guide lines Prohibit left turns 0.10 0.30 0.35 0.05 0.75 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 8400, and the ADT for after implementation is 9500. Determine: i. the appropriate countermeasures and ii. the expected reduction in crashes if the countermeasures ayou have proposed are implemented.

c) The Zambian Road Transport and Safety Agency (RTSA) has established crash reduction factors shown in the table below. CountermeasSure Reduction Factor Retime signals Provide left-turn signal phase Reduce speed limit on approaches Provide turning guide lines Prohibit left turns 0.10 0.30 0.35 0.05 0.75 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 8400, and the ADT for after implementation is 9500. Determine: i. the appropriate countermeasures and ii. the expected reduction in crashes if the countermeasures ayou have proposed are implemented.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter8: Intersection Control

Section: Chapter Questions

Problem 8P

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