An intersection has a three-phase signal with the movement allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired Phase 1 2 3 Allowed Movement NB L, SB L NB T/R, SB T/R EB L, WB L EB /T/R, WB T/R Analysis Flow Rate 330, 365 veh/h 1125, 1075 veh/h 110, 80 veh/h 250, 285 veh/h Saturation Flow Rate 1700, 1750 veh/h 3400, 300 veh/h 650, 600 veh/h 1750, 1800 veh/h Calculate the Following: 1.)Sum of flow ratios for critical lane groups 2.)minimum cycle length 3.)using v/c equation ratio, calculate the effective green time for phase 1
An intersection has a three-phase signal with the movement allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired
|
Phase |
1 |
2 |
3 |
|
|
Allowed Movement |
NB L, SB L |
NB T/R, SB T/R |
EB L, WB L |
EB /T/R, WB T/R |
|
Analysis Flow Rate |
330, 365 veh/h |
1125, 1075 veh/h |
110, 80 veh/h |
250, 285 veh/h |
|
Saturation Flow Rate |
1700, 1750 veh/h |
3400, 300 veh/h |
650, 600 veh/h |
1750, 1800 veh/h |
Calculate the Following:
1.)Sum of flow ratios for critical lane groups
2.)minimum cycle length
3.)using v/c equation ratio, calculate the effective green time for phase 1
4.)using v/c equation ratio, calculate the effective green time for phase 2
5.)using v/c equation ratio, calculate the effective green time for phase 3
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