Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Chapter 8, Problem 28P
To determine
Compare and contrast the different metering system that used in traffic signal ramp control and conditions for each of them.
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QUESTION 1
The approaches of a 4-leg signalized intersection are configured with 1 NB lane, 1 SB lane, 1 EB lane, and 1 WB lane and each of these
lanes serves LT, TH, and RT movements. The following volumes and phasing are provided.
approach EB
WB
NB
SB
movement LT TH RT LT TH RT LT TH RT LT TH RT
volume
120 480 160 80 560 100 20 200 40 12 160 48
2
6
What is the critical sum for the EB/WB barrier?
Task 3: The Intersection design
a. Describe the various principles involved in the design of at-grade intersections and the different types of at-grade intersections. Also, give an example of an appropriate location for the use of each type.
b. Design a suitable signal phasing system and phase lengths for the intersection using the Webster method. Show a detailed layout of the phasing system and the intersection geometry used for the geometric and traffic characteristics shown in table 6 below. And the saturation flow of the intersection is shown in table 7 Discuss the effect of increasing saturation flow rates by 10% higher on the cycle length?
Table 6:The geometric and traffic characteristics of the intersection
Approach (Width)
North (56m)
South (56 m)
East (68m)
West (68m)
Peak hour approach volumes
Left turn
133
73
168
134
Through movement
420
373
563
516
Right turn
140
135
169
178
Conflicting pedestrian volumes
900
1200
1200
900
PHF
0.95
0.95
0.95
0.95…
What are the considerations for installing traffic signals? briefly classify the traffic signal including example?
Chapter 8 Solutions
Traffic and Highway Engineering - With Mindtap
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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- Don't copy or I will reportarrow_forwardAn intersection has a four-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Phase 1 3 4 Allowed movements EB L, WB L 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 vehh 3350, 3400 veh/h 1725, 1750 veh/h 1700, 1750 veh/h Calculate the optimum cycle length (Assume 4 seconds lost time per phase) O 116.466 sec O 104.693 sec 97.315 sec O 101.399 secarrow_forwardExplain detail project about (traffic and signal analysis) Systematic wayarrow_forward
- Problem 1 (20%) Problem 19-1 in Roess, Prassas, McShane, 5th ed. Signals are being installed and timed for three intersections along a major rural arterial. Some relevant data is available for the arterial at the three intersections, as shown in the table below. It may be assumed that sight distances to left-turning vehicles are adequate in all cases. Which movements would likely require protected phasing for LTs, and why? VLT Vo No. of Opposing Avg Speed of Opposing No. of LT Crashes No. of LT Intersection Direction (veh/h) (veh/h) Lanes Traffic in 3 Yrs Lanes Provided 1 EB 100 1,200 3 50 mi/h WB 120 1,400 3 50 mi/h 2 EB 250 1,800 3 40 mi/h WB 220 2,000 3 40 mi/h 10 22 5880 1 1 2 3 EB 85 1,000 3 50 mi/h 3 1 WB 90 1,000 3 50 mi/h 4arrow_forwardAn intersection has a four-phase signal with the movements allowed in each phase and corresponding and saturation flow rates shown in the table below. Phase 1 2 3 4 Allowed movements EB L, WB L 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 vehh Calculate the sum of the flow ratios for the critical lane groups. O 0.714 O 0.723 0.751 0.702arrow_forwardi. Describe the major advantages and disadvantages of using traffic signals ii. Why traffic signal cycle timing requires an update from to time to time? iii.Why clearance time is considered as an important period?arrow_forward
- Please exaplain not just give answerarrow_forwardClassify the different types of traffic signs and mention the general objective of each type of sign; with sketch. Also show the general shape of these types of signs. ( Do according to Indian traffic standard)arrow_forwarda) At certain on-street parking, determine the number of parking spaces required to park vehicles in angles (0°, 45°, and 90° degree) if the length of the curb =240 ft, then show the layouts with dimensions. b) Briefly describe the classification of parking facilities and the methodology of parking studies. c) A traffic engineer records the travel times for six vehicles (1.35, 1.15, 1.75, 1.4, 1.8, and 1.4 minutes). These vehicles are traveling a 0.75-mile segment of a highway. Determine space mean speed (SMS) and time mean speed (TMS).arrow_forward
- QUESTION 3 What is the intersection sight distance (ft) needed at a yield controlled intersection for a passenger car to turn left onto a 2- way, 2-lane road with a design speed of 50 mph? [round to the nearest foot]arrow_forwardQUESTION 4 What is the intersection sight distance (ft) needed at a yield controlled intersection for a passenger car to turn right onto a 2- way, 2-lane road with a design speed of 50 mph? [round to the nearest foot]arrow_forwardWhat count period would you choose for the volume study at the intersection with signal cycle length (a) 60 seconds, (b) 90 seconds, and (c) 120 seconds?arrow_forward
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