Q5: The design speed of a multilane highway is 80 mi/h. What is the minimum stopping sight distance that should be provided on the road if (a) the road is level and (b) The road has a maximum grade of 4%? Assume the perception-reaction time = 2.5 sec.

Q5: The design speed of a multilane highway is 80 mi/h. What is the minimum stopping sight distance that should be provided on the road if (a) the road is level and (b) The road has a maximum grade of 4%? Assume the perception-reaction time = 2.5 sec.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter7: Intersection Design

Section: Chapter Questions

Problem 24P

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Q5: The design speed of a multilane highway is 80 mi/h. What is the minimum stopping
sight distance that should be provided on the road if (a) the road is level and (b) The road
2.5 sec.
has a maximum grade of 4%? Assume the perception-reaction time

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What distance will a vehicle travel before coming to a complete stop from a speed of 70 mph, (a) When the vehicle is traveling on a level roadway with no grade, (b-1) When the vehicle is traveling uphill on a roadway of constant grade = 0.10, (b-2) If the roadway grade is not constant but starts at 0.10 uphill and decreases to 0 at a continuous rate, would the braking distance be equal to, greater than, or less than that in the case of a constant 0.10 uphill grade (briefly explain why) (c) When the vehicle is traveling downhill on a roadway of constant grade = 0.10. Assume a perception-reaction time of 2.5 seconds, and an a/g value equal to 0.35.
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