1. Design the signal plan for the following intersection PHF 0.85 Target elc rat
ID: 1712274 • Letter: 1
Question
1. Design the signal plan for the following intersection PHF 0.85 Target elc ratio-0.85 Driver reaction time = 1.0 s Ped walking speed = 4.0 fps Speed limit 45 mi/h (all approaches) Moderate pedestrian volumes Level grades Deceleration rate 10 ft/s Crosswalk width-10 ft Default 1-2.0s Default e = 2.0 s 60 ft N 35 205 50 55 ft 250 175 40 40 111 35 2. Design the signal plan for the following intersection: (Note: leading and/or lagging design is required for E-W movements, use the patterm 3 phase plan) 265 JIL 10 15 750 PHF-098 Target vic ratio 0.95 Drivar Reaction Time-10 sec Grade G No Pedestrians Spood Limt: 30 mih Doccleration rate: 10 fs 2 Standard Vch Langth: 20 ft L-20 sec e-LO see 300 150 45 25 250 40 ftExplanation / Answer
The signal design procedure involves six major steps. They include (1) phase design, (2) deter-
mination of amber time and clearance time, (3) determination of cycle length, (4) apportioning of green time, (5) pedestrian crossing requirements, and (6) performance evaluation of the de-sign obtained in the previous steps
Two phase signals
Two phase system is usually adopted if through traffic is significant compared to the turning movement.
Cycle Time
Cycle time is the time taken by a signal to complete one full cycle of iterations. i.e. one complete rotation through all signal indications. It is denoted by C.
.
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