Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 8, Problem 6P
To determine
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To determine
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From given problem
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Given the volumes per movement and phasing pattern, allocate the green time to the 2 phases.
Use amber = 3 sec
All red = 2 sec
Starting loss = 2 sec
S = 1,900 pc/hr/lane
a.. Compute the y values
b. Compute the lost time if L= 2 x starting loss + 2 x all red
c. compute the optimum cycle time (the cycle length is normally rounded off to multiples of 5 or 10)
d. allocate the green time to phase 1 and 2
10-24. Determine the L₁0 noise level for the following highway traffic situation:
Autos = 2,000 per hour
Speed= 70 km/h
Speed= 70 km/h
Medium trucks = 200 per hour
Heavy trucks = 0
Observer-roadway distance = 60.0 m
Line-of-sight distance = 60.0 m
Barrier position = 5.0 m
1.0 m
Break in line-of-sight distance
Angle subtended = 160°
10-23. Determine the Lio noise level for the following highway traffic situation:
Autos = 1,500 per hour
Speed = 60 km/h
Speed= 60 km/h
Medium trucks = 150 per hour
Heavy trucks =0
Observer-roadway distance = 40.0 m
Line-of-sight distance = 40.0 m
Barrier position = 3.0 m
Break in line-of-sight distance = 6.0 m
Angle subtended = 170°
Answer: L10 = 51 dBA
Chapter 8 Solutions
Traffic and Highway Engineering
Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 8PCh. 8 - Prob. 9PCh. 8 - Prob. 10P
Ch. 8 - Prob. 11PCh. 8 - Prob. 12PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - Prob. 16PCh. 8 - Prob. 17PCh. 8 - Prob. 18PCh. 8 - Prob. 19PCh. 8 - Prob. 20PCh. 8 - Prob. 21PCh. 8 - Prob. 22PCh. 8 - Prob. 23PCh. 8 - Prob. 24PCh. 8 - Prob. 25PCh. 8 - Prob. 26PCh. 8 - Prob. 27PCh. 8 - Prob. 28P
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- 100w 200 200k y at ptcarrow_forwardQ4: a. At a certain at grade intersection, it's decided to use a 4 phases traffic signal for the four approaches shown below. South Approach Width (m) Actual flow (DHV) pe/hr North East West 7 8 12 10.5 331 427 1104 715 Left turn vehicles of 478 630 1953 1047 saturation flow Assuming the following for each phase: Starting delay and falling discharge time = 3 sec, amber time = 5 sec, all red = 1 sec, red/amber I sec. Find the optimum cycle time and the controller green for each phase.arrow_forwardQ3)-Draw the timing diagram if the signal is 4 phase G2=24, G3=20, G4-30 sec. knowing sec, then calculate the Optimum cycle length Co. with green times G1=18, that Amber time = lost time per phase = 4arrow_forward
- Given the volumes per movement and phasing pattern, allocate the green time to the 2 phases. Use amber = 3 sec All red = 2 sec Starting loss = 2 sec S = 1,900 pc/hr/lane A. allocate the green time to phase 1 and 2arrow_forwardQ2- The table below lists the needed data for designing a traffic signal for a 3-leg signalized intersection. Determine the following using Webster's method; assume Qs is 2000 vphpl. 1- Compute the actual green and actual red intervals. 2- Draw the cycle timing diagram. Qa (vph) Amber All-red ts (sec) Lane 1 Lane 2 (sec) (sec) Phase I 399 710 4 Phase II 520 366 3 Phase III 144 210 3 122 322arrow_forward10-25. In preparation for a public hearing on a proposed interstate bypass at Non- troppo, Michigan (Figure P-10-25a), the County Road Commission has re- quested that you prepare an estimate of the potential for violation of FHA noise standards 75 m from the interstate. The city engineer has supplied sketch maps (see Figure P-10-25b) and data summary for your use. Data for 1-481 at Pianissimo Avenue Estimated traffic: Automobiles: 7,800 per hour at 88.5 km/h Medium trucks: 520 per hour at 80.5 km/h Heavy trucks: 650 per hour at 80.5 km/h Roadway configuration: Depressed Section length: 857.25 m east and 857.25 m west of center line of Pianissimo Avenue Assume that the receiver is located on the center line of Pianissimo Avenue 75.00 m from the center line of 1-481. Answer: L₁ at observer = 68.6, or 69, dBAarrow_forward
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