PROBLEM 4. A signalized intersection has a 4-phase signal with the allowed movementsshown in the table below. The analysis flow and saturation flow rates are also shown in the sametable. Consider an approaching speed of 20km/h and a grade of 0% and 0.5secs of all in red-time.Phase1234Analysis flow rate250, 225 veh/h970, 1030 ve260, 235 ve215 veh/hSaturation flow rate1755, 1720 veh/h3345, 3400 veh/h1730, 1750 veh/h1700, 1750 veh/hAllowed movementsEB L, WB LEB T/R, WB T/RSB L, SB T/RNB L, NB T/RAssumption: lost time = 4sec per phase, v/c = 0.95Questions: Compute the level of service for the southbound approach using the minimum cyclelength.

Solution: Critical Flow Ratio: Phase 1: YEBleft=2451750 , YWBL=2301725YEBL=0.14 ,…

PROBLEM 4. A signalized intersection has a 4-phase signal with the allowed movements shown in the table below. The analysis flow and saturation flow rates are also shown in the same table. Consider an approaching speed of 20km/h and a grade of 0% and 0.5secs of all in red-time.

PROBLEM 4. A signalized intersection has a 4-phase signal with the allowed movements shown in the table below. The analysis flow and saturation flow rates are also shown in the same table. Consider an approaching speed of 20km/h and a grade of 0% and 0.5secs of all in red-time.

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Question

PROBLEM 4. A signalized intersection has a 4-phase signal with the allowed movements
shown in the table below. The analysis flow and saturation flow rates are also shown in the same
table. Consider an approaching speed of 20km/h and a grade of 0% and 0.5secs of all in red-time.
Phase
1
2
3
4
Analysis flow rate
250, 225 veh/h
970, 1030 ve
260, 235 ve
215 veh/h
Saturation flow rate
1755, 1720 veh/h
3345, 3400 veh/h
1730, 1750 veh/h
1700, 1750 veh/h
Allowed movements
EB L, WB L
EB T/R, WB T/R
SB L, SB T/R
NB L, NB T/R
Assumption: lost time = 4sec per phase, v/c = 0.95
Questions: Compute the level of service for the southbound approach using the minimum cycle
length.

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