10-21. Consider an ideal single lane of road that carries 1,200 vehicles per houruniformly spaced along the road and determine the following:a. The average center-to-center spacing of the vehicles for an average traf-fic speed of 40.0 km/h.b. The number of vehicles in a 1 km length of the lane when the averagespeed is 40.0 km/h.c. The sound level (dBA) 60.0 m from a 1 km length of this roadway withautomobiles emitting 71 dBA at the edge of an 8.0 m-wide roadway.Assume that the autos travel at a speed of 40.0 km/h, that the soundradiates ideally from a hemisphere, and that contributions of less than0.3 dBA may be ignored.Answers:a. Average center-to-center spacing = 33.3 mb. Number of vehicles in a 1 km length = 30 vehicles/kmc. L₂ = 47.47 or 48 dBA

Answered: Image /qna-images/answer/4592856f-bcc4-45d5-8c68-24586470819a.jpg

21. Consider an ideal single lane of road that carries 1,200 vehicles per hour uniformly spaced along the road and determine the following: a. The average center-to-center spacing of the vehicles for an average traf- fic speed of 40.0 km/h. b. The number of vehicles in a 1 km length of the lane when the average speed is 40.0 km/h.

21. Consider an ideal single lane of road that carries 1,200 vehicles per hour uniformly spaced along the road and determine the following: a. The average center-to-center spacing of the vehicles for an average traf- fic speed of 40.0 km/h. b. The number of vehicles in a 1 km length of the lane when the average speed is 40.0 km/h.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter7: Intersection Design

Section: Chapter Questions

Problem 28P

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