UNIVERSITY OF THE DISTRICT OF COLUMBIA School of Engineering and Applied Science

Question

UNIVERSITY OF THE DISTRICT OF COLUMBIA School of Engineering and Applied Sciences Civil Engineering Fall 2017 Quiz 6: CVEN-351/ Transportation Engineering Date: 11/2/2017 NAME: Problem 1 What is the level of service for the ramp combination and traffic conditions shown below? PHF ·0.81. The terrain is level. Lane widths are 12 ft, and there are no obstructions. Traffic is urban commute traffic. Free-flow speed on the ramps is 45 MPH. 1800 VPH 300 ft 2 lanes 800 ft 8% trucks 2000 ft 500 VPH, 8% trucks 300 VPH, 6% trucks

Explanation / Answer

Answer:-

We have to know about LOS.

first calcualte the fHV = 1/ ( 1+ PT (ET+1)

plug in the all values fHV = 1/ ( 1+ (8/6) (1+1) = 0.375

use the formual for Vp = V / PHF*N*fHV *fP

Vp = 1800 VPH , PHF = 0.81 , N =1 , fHV =0.375, fP = 1

V p = 1800 / ( 0.81*1*0.375*1) = 5925.92 pc/h/ln   = 98.76 pc/min/ln

Vp is greater than 45 pc/mi/ln so the LOS for this slope combination is F.

LOS =F.

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