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A direction sign is needed before a highway off-ramp. The highway 85th percentile of 50 mph. Vehicle normally make the turn (enter the ramp) at the design speed of 25 mph and cars travel at a constant speed of 50 mph during the perception-reaction time. Using perception reaction time of 1.5 seconds to read and understand the sign and a deceleration (braking) rate of 0.3g, what is the minimum distance the direction sign should be installed in advance of the ramp?

A direction sign is needed before a highway off-ramp. The highway 85th percentile of 50 mph. Vehicle normally make the turn (enter the ramp) at the design speed of 25 mph and cars travel at a constant speed of 50 mph during the perception-reaction time. Using perception reaction time of 1.5 seconds to read and understand the sign and a deceleration (braking) rate of 0.3g, what is the minimum distance the direction sign should be installed in advance of the ramp?

Structural Analysis
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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A direction sign is needed before a highway off-ramp. The highway 85th percentile of 50 mph. Vehicle normally make the turn (enter the ramp) at the design speed of 25 mph and cars travel at a constant speed of 50 mph during the perception-reaction time. Using perception reaction time of 1.5 seconds to read and understand the sign and a deceleration (braking) rate of 0.3g, what is the minimum distance the direction sign should be installed in advance of the ramp?
Transcribed Image Text:A direction sign is needed before a highway off-ramp. The highway 85th percentile of 50 mph. Vehicle normally make the turn (enter the ramp) at the design speed of 25 mph and cars travel at a constant speed of 50 mph during the perception-reaction time. Using perception reaction time of 1.5 seconds to read and understand the sign and a deceleration (braking) rate of 0.3g, what is the minimum distance the direction sign should be installed in advance of the ramp?
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