A driver is traveling 70 mi/hr on a road with a -2% downgrade. The driver's vehicle has a braking efficiency of 90% and has anti-lock brakes. There is a stalled car on the road 500 ft ahead of the driver. The road is in good condition and is initially dry, but is wet for a 200 ft stretch just before the stalled car. What is the maximum allowable perception-reaction time of the driver such that she can still stop before hitting the stalled car? (Assume theoretical stopping distance, ignore air resistance, and let fri = 0.013.)

A driver is traveling 70 mi/hr on a road with a -2% downgrade. The driver's vehicle has a braking efficiency of 90% and has anti-lock brakes. There is a stalled car on the road 500 ft ahead of the driver. The road is in good condition and is initially dry, but is wet for a 200 ft stretch just before the stalled car. What is the maximum allowable perception-reaction time of the driver such that she can still stop before hitting the stalled car? (Assume theoretical stopping distance, ignore air resistance, and let fri = 0.013.)

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

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 driver is traveling 70 mi/hr on a road with a -2% downgrade. The driver's vehicle has a
braking efficiency of 90% and has anti-lock brakes. There is a stalled car on the road 500 ft
ahead of the driver. The road is in good condition and is initially dry, but is wet for a 200 ft
stretch just before the stalled car. What is the maximum allowable perception-reaction time
of the driver such that she can still stop before hitting the stalled car? (Assume theoretical
stopping distance, ignore air resistance, and let fri = 0.013.)

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