4. An intersection has a 3-timing stage signal with the movements allowed in each timing stage and corresponding analysis and saturation flow rates shown below. Consider that the total lost time is 12 seconds and a critical v/c ratio of 0.85 was desired. The cycle length is 60 seconds. Calculate the delay and level of service for (a) the westbound left lane group, (b) the westbound approach and (c) the whole intersection. Timing Stage Allowed movements Analysis flow rate (veh/h) Saturation flow rate(veh/h) Effective green (sec) 1 2 NBL SBL NB T/R 330 365 1125 1700 1750 13.9 SB T/R EB L 1075 110 3400 3300 650 22.1 WB L 80 600 3 EB T/R WB T/R 250 285 1750 1800 11.3

4. An intersection has a 3-timing stage signal with the movements allowed in each timing stage and corresponding analysis and saturation flow rates shown below. Consider that the total lost time is 12 seconds and a critical v/c ratio of 0.85 was desired. The cycle length is 60 seconds. Calculate the delay and level of service for (a) the westbound left lane group, (b) the westbound approach and (c) the whole intersection. Timing Stage Allowed movements Analysis flow rate (veh/h) Saturation flow rate(veh/h) Effective green (sec) 1 2 NBL SBL NB T/R 330 365 1125 1700 1750 13.9 SB T/R EB L 1075 110 3400 3300 650 22.1 WB L 80 600 3 EB T/R WB T/R 250 285 1750 1800 11.3

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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Question

Please calculate the level of service and delay for the westbound left lane group, the westbound approach, and the whole intersection. I provided LOS chart for reference.

4. An intersection has a 3-timing stage signal with the movements allowed in each timing
stage and corresponding analysis and saturation flow rates shown below. Consider that
the total lost time is 12 seconds and a critical v/c ratio of 0.85 was desired. The cycle
length is 60 seconds. Calculate the delay and level of service for (a) the westbound left
lane group, (b) the westbound approach and (c) the whole intersection.
Timing Stage
Allowed movements
Analysis flow rate (veh/h)
Saturation flow rate(veh/h)
Effective green (sec)
1
NBL SB L
330 365
1700 1750
13.9
2
NB T/R SB T/R EB L
1075
3300
1125
3400
22.1
WB L
110 80
650 600
3
EB T/R WB T/R
250
285
1750
1800
11.3

LOS
A
B
с
D
E
F
Control Delay per Vehicle (s/veh)
≤ 10
> 10-20
> 20-35
> 35-55
> 55-80
> 80

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Step 2: Calculate d1

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Step 3: Calculate delay & LOS

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Step 4: Table

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Step 5: Sample calculation for approach delay & LOS

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Step 6: Calculate intersection delay & LOS

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