A turning movement count and a saturation flow study were conducted at a major intersection on an expressway with configuration as presented in Fig.1. The peak-hour volumes and saturation flows obtained from the studies for each movement are presented in Tables 1 and 2, respectively.i) Using the Webster method, determine a suitable preset signal timing for the intersection using a phasing plan that will yield the minimum cycle length out of all possible phasing plans.ii) Also provide a diagrammatic representation of the signal sequence at the intersection. Assume a yellow interval of 3s, all-red interval of 2s and a peak hour factor of 0.95 for all the approaches. Table 1: Peak-Hour VolumesVehicle classPrivate carsTaxiesPickups/4WDsLight bus(trotro)Large busTrucks/TrailersTotalAt7588 14925434813Table 3: PCU FactorsVehicle class1 Private car1 Taxi1 Pickup/4WD1 Light bus (trotro)1 Large bus1 Truck/TrailerBC D128 128PCU factor1.01.01.01.3DOMNS23Peak-hour volumes (veh/hr) by movement typeH I J2.253.590149 1054381 8121 21Table 2: Saturation FlowMovemen A B C D E F30ESaturation 160 185 185 160 185 185flow00000(pcu/hr)35 40 12354057 22 42 25 63 63156 11717 171 2 1333 4 4 3250 425 425 300220130331 331115F G66772235 46 133999 9946 116 11633G H1600331850810351K2272544140128 72LLJ K L185 160 185 1850 0 0 03035101995сло1100 BEI FFig.1: Traffic Movements at a Major IntersectionN

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Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

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A turning movement count and a saturation flow study were conducted at a major intersection on an expressway with configuration as presented in Fig.1. The peak-hour volumes and saturation flows obtained from the studies for each movement are presented in Tables 1 and 2, respectively.

i) Using the Webster method, determine a suitable preset signal timing for the intersection using a phasing plan that will yield the minimum cycle length out of all possible phasing plans.

ii) Also provide a diagrammatic representation of the signal sequence at the intersection. Assume a yellow interval of 3s, all-red interval of 2s and a peak hour factor of 0.95 for all the approaches.

Table 1: Peak-Hour Volumes
Vehicle class
Private cars
Taxies
Pickups/4WDs
Light bus
(trotro)
Large bus
Trucks/Trailers
Total
A
t
75
88 149
25
43
48
13
Table 3: PCU Factors
Vehicle class
1 Private car
1 Taxi
1 Pickup/4WD
1 Light bus (trotro)
1 Large bus
1 Truck/Trailer
B
C D
128 128
PCU factor
1.0
1.0
1.0
1.3
DOMNS
23
Peak-hour volumes (veh/hr) by movement type
H I J
2.25
3.5
90
149 105
43
81 81
21 21
Table 2: Saturation Flow
Movemen A B C D E F
30
E
Saturation 160 185 185 160 185 185
flow
0
0
0
0
0
(pcu/hr)
35 40 12
35
40
57 22 42 25 63 63
15
6 11
7
17 17
1 2 1
3
3
3 4 4 3
250 425 425 300
220
130
331 331
115
F G
66
77
22
35 46 13
39
99 99
46 116 116
33
G H
160
0
33
185
0
8
10
3
51
K
227
25
44
14
0
1
28 72
L
L
J K L
185 160 185 185
0 0 0 0
30
35
10
19
95
сло
1
100

B
EI F
Fig.1: Traffic Movements at a Major Intersection
N

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