An intersection has three phases, and the information for that intersection is provided in the ta...
- An intersection has three phases, and the information for that
intersection is provided in the table below. Calculate:
- The sum of the flow ratios for the critical lane groups
- Minimum cycle length, optimal cycle length and effective green time for each phase using the minimum cycle length assuming the lost time is 4 seconds per phase and the critical intersection v/c of 0.90 is desired.
- The northbound approach delay and level of service.
|
Phase |
1 |
2 |
3 |
|
Allowed Movements |
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/hr |
1125, 1075 veh/hr |
110, 80 veh/hr 250, 285 veh/hr |
|
Saturation Flow Rate |
1700, 1750 veh/hr |
3400, 3300 veh/hr |
650, 600 veh/hr 1750, 1800 veh/hr |
Homework Answers
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An intersection has three phases, and the information for that intersection is provided in the ta...
The intersection has a four-timing-state signal with the movements allowed in each timing stage a...
the intersection has a four-timing-state signal with the
movements allowed in each timing stage and corresponding analysis
and saturation flow rates shown in the table.
a) calculate the minimum cycle length and effective green time
for each timing stage (balancing v/c for the critical lane groups).
assume the lsot time is 4 seconds per timing stage and a criticsl
intersection v/c of 0.9 is desired.
b) calculate the intersection control delay and level of
service, assumjng pre-times isolated intersection.
4...
Description D to solve Questions 12-14 An intersection has a four-timing-stage signal with the movements allowed...
Description D to solve Questions 12-14 An intersection has a four-timing-stage signal with the movements allowed in each timing stage and corresponding analysis and saturation flow rates shown in Table below. Timing stage 1 2 3 4 Allowed movements EB L, WBL EB T/R, WB T/R SB L, SB T/R NB L, NB T/R Analysis Flow rate 245, 230 veh/h 975,1030 veh/h 255,235 veh/h 225,215 veh/h Saturation flow rate 1750, 1725 veh/h 3350,3400 veh/h 1725,1750 veh/h 1700, 1750 veh/h Question...
4.A two-phase signal system is to be designed for an isolated intersection with a peak hour tacto...
Transportation
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4.A two-phase signal system is to be designed for an isolated intersection with a peak hour tactor 81 0.99. TIL lane volumes are: Phase A-550 veh/hr, Phase B 600 veh/hr, The total lost time L is 14 sec. Determine an appropriate cycle length for the intersection that will satisfy the following conditions: minimum cycle length-45 sec, maximum cycle length = 120 sec, maximum critical ve ratio (Xc)-0.85 and The saturation flow per lane for each...
2. Determine the minimum cycle length for the intersection with the volumes shown on the table...
2. Determine the minimum cycle length for the intersection with the volumes shown on the table below. The intersection is designed to have the following three phases: Phase A for left-turn movements from the EB and WB approaches; Phase B for the through and right movements from the EB and WB approaches; Phase C serving all movements for the NB and SB approaches. EB approach WB approach N B approach SB approach LT RLT RL TRL TR 110 500 200...
19-5 Traffic Engineering 5th edition Develop a signal timing for intersection: N/S 30 ft (1 lane NB/ 1 lane SB) E/W 85 ft ( 3 lanes EB/ 3 lanes WB...with separate left turn lane on EB and WB approach)...
19-5 Traffic Engineering 5th edition Develop a signal timing for intersection: N/S 30 ft (1 lane NB/ 1 lane SB) E/W 85 ft ( 3 lanes EB/ 3 lanes WB...with separate left turn lane on EB and WB approach) Veh/hr EB: Left - 200, Through - 800, Right 120 WB: Left - 160, Through - 1050, right - 100 NB: Left - 10, Through - 420, right - 10 SB: Left - 12, Through 400, right - 8 PHF =...
An intersection has a four-phase signal with the movements allowed in each phase
An intersection has a four-phase signal with the movements allowed in each phase and the corresponding analysis and saturation flow rates shown in the table below. Please complete the following: a. Calculate the sum of flow ratios for the critical lane groups. b. Calculate the minimum cycle length and effective green time for each phase (balancing v/c ratio for each lane group). Assume the lost time is 4 sec/phase and a critical intersection vc ratio of 0.95 is desired. c. Calculate the optimal...
A pretimed signal controls a four-way intersection with no turning permitted and zero lost time.
A pretimed signal controls a four-way intersection with no turning permitted and zero lost time. The eastbound and westbound traffic volumes are 500 and 600 veh/h. respectively, and the two movements share the same effective green and effective red portions of the cycle. The northbound and southbound directions also share cycle times, with volumes of 650 and 300 veh/h. If the saturation flow of castbound and westbound approaches is 2100 veh/h, and the saturation flow of northbound and southbound approaches...
265 so 50 Target vic ratio 24 n Speed limits 24 n 1o 25 .Determine if...
265 so 50 Target vic ratio 24 n Speed limits 24 n 1o 25 .Determine if protected left turn phase is required . Determine number of phases . Determine cycle length applying Webster Method. Allowable minimum and maximum cycle length are 60 secs and 180 secs respectively .Assume yellow time of 3 secs and all red time of 2 secs for all phases. Saturation flow rate for through lane and left turn lane are 1700 veh/hr/n and 1200 veh/hr/In respectively....
3- Consider the third example solved in the lecture videos. Two additional 12-ft through lanes are...
3- Consider the third example solved in the lecture videos. Two additional 12-ft through lanes are added to Vine Street (the street in the intersection of the first example solved in the lecture videos), one lane in each direction. If the peak-hour traffic volumes are unchanged but the Vine Street left-turn saturation flow rates increase by 120 veh/h because of the added through lanes, what would the revised effective green time, yellow time, and all-red time be for each phase?...
4- Consider Problem 3. Calculate the new minimum pedestrian green time, assuming the effective crosswalk width...
4- Consider Problem 3. Calculate the new minimum pedestrian green time, assuming the effective crosswalk width is 6 ft and the maximum number of crossing pedestrians in any phase is 20. This is the problem 3 Two additional 12-ft through lanes are added to Vine Street, one lane in each direction. If the peak-hour traffic volumes are unchanged but the Vine Street left-turn saturation flow rates increase by 120 veh/h because of the added through lanes, what would the revised...
the intersection has a four-timing-state signal with the
movements allowed in each timing stage and corresponding analysis
and saturation flow rates shown in the table.
a) calculate the minimum cycle length and effective green time
for each timing stage (balancing v/c for the critical lane groups).
assume the lsot time is 4 seconds per timing stage and a criticsl
intersection v/c of 0.9 is desired.
b) calculate the intersection control delay and level of
service, assumjng pre-times isolated intersection.
4...
Description D to solve Questions 12-14 An intersection has a four-timing-stage signal with the movements allowed in each timing stage and corresponding analysis and saturation flow rates shown in Table below. Timing stage 1 2 3 4 Allowed movements EB L, WBL EB T/R, WB T/R SB L, SB T/R NB L, NB T/R Analysis Flow rate 245, 230 veh/h 975,1030 veh/h 255,235 veh/h 225,215 veh/h Saturation flow rate 1750, 1725 veh/h 3350,3400 veh/h 1725,1750 veh/h 1700, 1750 veh/h Question...
Transportation
Can correct the
answer
4.A two-phase signal system is to be designed for an isolated intersection with a peak hour tactor 81 0.99. TIL lane volumes are: Phase A-550 veh/hr, Phase B 600 veh/hr, The total lost time L is 14 sec. Determine an appropriate cycle length for the intersection that will satisfy the following conditions: minimum cycle length-45 sec, maximum cycle length = 120 sec, maximum critical ve ratio (Xc)-0.85 and The saturation flow per lane for each...
2. Determine the minimum cycle length for the intersection with the volumes shown on the table below. The intersection is designed to have the following three phases: Phase A for left-turn movements from the EB and WB approaches; Phase B for the through and right movements from the EB and WB approaches; Phase C serving all movements for the NB and SB approaches. EB approach WB approach N B approach SB approach LT RLT RL TRL TR 110 500 200...
265 so 50 Target vic ratio 24 n Speed limits 24 n 1o 25 .Determine if protected left turn phase is required . Determine number of phases . Determine cycle length applying Webster Method. Allowable minimum and maximum cycle length are 60 secs and 180 secs respectively .Assume yellow time of 3 secs and all red time of 2 secs for all phases. Saturation flow rate for through lane and left turn lane are 1700 veh/hr/n and 1200 veh/hr/In respectively....
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