Assume that passenger car equivalents are 1.5 for trucks (ET), 1.6 for left-turns (EL), and 1.4 for right-turns (ER), and saturation flow qs= 160 x (curb-to-curb width / # of lanes) equivalent passenger-car units per hour per lane (pcu/hr/ln). Pedestrian walk speed (PS) is 4 ft/sec, and the effective width of crosswalk (WE) is 9 ft. Given that the intergreen time is 8.0 seconds and lost time is 3.5 seconds per phase, design a 2-phase signal timing plan using the Webster’s method. Curb-to-curb widthPeak-hour through movement volumesPeak-hour right-turn movement volumesPeak-hour left-turn movement volumesPHFPassenger carsTrucksPedestrians per phase (N₂)N-S Approaches50 feet (4 lanes)500 (north)600 (south)100 (north)130 (south)100 (north)95 (south)0.9095%5%20 (north)25 (south)E-W Approaches48 feet (4-lanes)400 (east)350 (west)120 (east)100 (west)75 (east)125 (west)0.9095%5%25 (east)30 (west)

To design a 2-phase signal timing plan using Webster's method, Calculate the critical flow ratio (y)…

Answered: Assume that passenger car equivalents…

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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Assume that passenger car equivalents are 1.5 for trucks (E_T), 1.6 for left-turns (E_L), and 1.4 for right-turns (E_R), and saturation flow q_s= 160 x (curb-to-curb width / # of lanes) equivalent passenger-car units per hour per lane (pcu/hr/ln). Pedestrian walk speed (P_S) is 4 ft/sec, and the effective width of crosswalk (W_E) is 9 ft. Given that the intergreen time is 8.0 seconds and lost time is 3.5 seconds per phase, design a 2-phase signal timing plan using the Webster’s method.

Curb-to-curb width
Peak-hour through movement volumes
Peak-hour right-turn movement volumes
Peak-hour left-turn movement volumes
PHF
Passenger cars
Trucks
Pedestrians per phase (N₂)
N-S Approaches
50 feet (4 lanes)
500 (north)
600 (south)
100 (north)
130 (south)
100 (north)
95 (south)
0.90
95%
5%
20 (north)
25 (south)
E-W Approaches
48 feet (4-lanes)
400 (east)
350 (west)
120 (east)
100 (west)
75 (east)
125 (west)
0.90
95%
5%
25 (east)
30 (west)

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