Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 8, Problem 13P
To determine
At a signalized intersection on safety and delay write the implications on conventionalincreasing number of phases and relationships.
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Q3c. At a three leg (T) intersection, the two-way peak hour volume on the minor road is 500 veh/hr and that on the major road is 600 veh/hr. As a Traffic Engineer, what type of intersection control will you propose? What is the basis of your proposal?
If there is no pedestrian traffic, the yellow interval needed by northbound vehicles to clear the intersection travelling at a speed of 35 mph is:
Question 16 options:
4.6 sec
5.0 sec
4.75 sec
none of the above
A signalized intersection has two lane groups. The two WBT lanes (lane group #1) have a total volume of 863 pc/h and an average control delay of 24.5 seconds. The one WBL lane (lane group #2) has a volume of 203 pc/h and an average control delay of 36.5 seconds. What is the approach's LOS?
Group of answer choices
LOS A
LOS D
LOS C
LOS B
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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- A poorly timed signal or one that is not justified can have a negative impact on the opration of the intersection because it (CHOOSE ALL THAT IS APPLICABLE) Choices: A. Consumes greater power/electricity B. Requires a lot of maintenance and repair C. Increases vehicle delay D. Increases the rate of vehicle crashesarrow_forwardA local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight distance problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.arrow_forwardA local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.arrow_forward
- Answer True/False to the following: 1) A strong degree of uniformity in the design of traffic facilities guarantees uniform reactions from drivers. 2) The traffic signal warrant that several agencies do not recommend using is the Peak Hour Traffic Volume warrant. 3) It is reasonable to use a higher unit extension time value on an actuated signal approaches with higher speeds. 4) According to the Roundabout Design Guide volume-to-capacity ratio of 0.85 must be the threshold for acceptable operation at a roundabout entry.arrow_forwardTRANSPORTATION ENGINEERING-TRAFFIC SIGNALS" Recent analysis at an approach to pre-time signalized intersection indicate that the volume-to-capacity ratio (v/c) is 0.8, htat saturation flow rate (s) is 1600 vehicles/hour, and the effective green time is 50 seconds. If the average delay, assuming D/D/1 is 11.25 seconds per vehicle, determine the arrival flow rate (vehicles/hour) and the cycle length.arrow_forwardAn signalized intersection located in Baghdad Capital with four phases, if EYi=0.77, lost time for each phase (Lt = 3.0 sec. ).The cycle length for this signalized intersection is equal: * 100 sec. 110 sec. O 107 min. O 41 sec. O 105 sec.arrow_forward
- The Module discusses left turn phases at a signalized intersection. Leading left turn phase is the predominant left turn treatment at most signalized intersection. Why do you think leading left tum phase is preferred over lagging left turn phase?arrow_forwardUnder what condition is a value of 0.5 assigned to the parameter K in the expression for the lane group delay calculation?arrow_forward3. Check whether the following 4-way intersection with the two minor streets controlled by "STOP" sign needs to be signalized using warrants: Annual crashes: ● 5 right angle with injuries 6 left-turn with major injuries 3 rear end (PDO) 4 pedestrian crashes with 2 major injuries) Traffic data Time 5-6 am 6-7 am 7-8 am 8-9 am 9-10 am 10-11 am 11 - 12 n 12-1 pm 1-2 pm 2-3 pm 3-4 pm 4-5 pm 5-6 pm 6-7pm 7-8 pm 8-9 pm Main Street Volume (veh/hr) EB 450 555 625 575 490 550 565 590 480 565 575 600 675 550 450 400 WB 440 525 575 560 460 490 540 545 420 490 515 550 595 490 390 350 Minor Street Volume (veh/hr) NB 50 100 120 90 80 90 95 100 85 100 110 135 105 80 55 SB 60 75 115 125 100 95 98 100 110 95 115 130 150 110 80 60 Pedestrian Volume (Ped/Hr), Crossing the Main 20 85 135 145 120 110 105 125 135 95 85 110 155 140 100 60arrow_forward
- Determine whether a T intersection (one leg on the minor approach) with the hourly volume data satisfy MUTCD Warrant 3 (peak-hr vehicular volume) for signalization. All approaches have one lane entering the intersection. For the warrant that is met, explain how the warrant is met (rules applied, hours in which the volume criteria were met, etc.) and refer to necessary graphs and tables. The major street speed limit is 60 km/h, and the minor street speed limit is 40 km/h.arrow_forwardPlease calculate the level of service and delay for the westbound left lane group, the westbound approach, and the whole intersection. I provided LOS chart for reference.arrow_forward4) Traffic on the eastbound approach of a signalized intersection is traveling at 35 mi/hr, with a density of 46 veh/mi/In. The duration of the red signal indication for this approach is 30 sec. If the saturation flow is 1900 veh/h/In with a density of 52 veh/mi/In, and the jam density is 125 veh/mi/In, determine the following: (i) The length of the queue at the end of the red phase (ii) The maximum queue length (iii) The time it takes for the queue to dissipate after the end of the red indication.arrow_forward
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