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?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter8: Intersection Control

Section: Chapter Questions

Problem 14P

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Concept explainers

Intersection Design

An intersection is a location where two or more roads or railways meet or join. The traffic movement is controlled at the intersection that depends on its design and type. It governs the operation, efficiency, speed, capacity, and safety of the highways, airways, and railways. The movement of the pedestrian causes hazards and delays at the intersection.

Question

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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