A turning movement count and a saturation flow study were conducted at a majorintersection on an expressway with configuration as presented in Fig.1. The peak-hourvolumes and saturation flows obtained from the studies for each movement arepresented in Tables 1 and 2, respectively. Using the Webster method, determine asuitable preset signal timing for the intersection using a phasing plan that will yield theminimum cycle length out of all possible phasing plans. Also provide a diagrammaticrepresentation of the signal sequence at the intersection. Assume a yellow interval of3s, all-red interval of 2s and a peak hour factor of 0.95 for all the approaches. Note: Notwo movements should conflict during the determination of the phasing plan.TurFFig.1: Traffic Movements at a Major IntersectionN Table 1: Peak-Hour VolumesVehicle classPrivate carsTaxiesPickups/4WDsLight bus(trotro)Large busTrucks/TrailersTotaltA758825flow(pcu/hr)48133250Saturation 160 18500Table 2: Saturation FlowMovemen A B CTable 3: PCU FactorsVehicle class1 Private car1 Taxi1 Pickup/4WD1 Light bus (trotro)1 Large bus1 Truck/Trailer23GNWOOB3.5C128 128149 14943 43OLPCU factor1.01.01.01.32.258121 2144425 425Peak-hour volumes (veh/hr) by movement typeDG H I JD185 160009010581 57153300E301850E135 40 12FF18506699 993977 46 116 116221333 332267121115 220 1304211G1600258-H185063173331||185063173331J1600008103K L223025 35710510128 72 100지441850141ଦୂL19951850сло[

GIVEN DATA:-⇒Yellow light interval= 3s⇒Red light interval= 2s⇒Peak hour factor= 0.95

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. 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. 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. Note: No two movements should conflict during the determination of the phasing plan.

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. 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. 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. Note: No two movements should conflict during the determination of the phasing plan.

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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Concept explainers

Intersection Design

An intersection is a location where two or more roads or railways meet or join. The traffic movement is controlled at the intersection that depends on its design and type. It governs the operation, efficiency, speed, capacity, and safety of the highways, airways, and railways. The movement of the pedestrian causes hazards and delays at the intersection.

Question

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. 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. 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. Note: No
two movements should conflict during the determination of the phasing plan.
Tur
F
Fig.1: Traffic Movements at a Major Intersection
N

Table 1: Peak-Hour Volumes
Vehicle class
Private cars
Taxies
Pickups/4WDs
Light bus
(trotro)
Large bus
Trucks/Trailers
Total
t
A
75
88
25
flow
(pcu/hr)
48
13
3
250
Saturation 160 185
0
0
Table 2: Saturation Flow
Movemen A B C
Table 3: PCU Factors
Vehicle class
1 Private car
1 Taxi
1 Pickup/4WD
1 Light bus (trotro)
1 Large bus
1 Truck/Trailer
23
GNWOO
B
3.5
C
128 128
149 149
43 43
OL
PCU factor
1.0
1.0
1.0
1.3
2.25
81
21 21
4
4
425 425
Peak-hour volumes (veh/hr) by movement type
D
G H I J
D
185 160
0
0
90
105
81 57
15
3
300
E
30
185
0
E
135 40 12
F
F
185
0
66
99 99
39
77 46 116 116
22
13
33 33
22
6
7
1
2
1
115 220 130
42
11
G
160
0
25
8-
H
185
0
63
17
3
331
||
185
0
63
17
3
331
J
160
0
00
8
10
3
K L
22
30
25 35
7
10
5
1
0
1
28 72 100
지
44
185
0
14
1
ଦୂ
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185
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