Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 6, Problem 15P
To determine
If the driveway will be affected or not.
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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?
3. An intersection approach has two lane groups: left-turn lane group, and through/right-turn lane
group. The control delay is 37 seconds/vehicle for the left-turn lane group, and 27
seconds/vehicle for the through/right-turn lane group. The analysis flow rate is 97
vehicles/hour for the left-turn lane group, and 450 vehicles/hour for the through/right-turn lane
group. Calculate the approach control delay and write the corresponding level of service (LOS)
for the approach in the box below.
A right-turn-only lane at the west-east approach to a signalized intersection can store
a maximum of five vehicles. The traffic volume at the approach is 900 veh/h and 20%
of the traffic take right turns. The cycle time of the traffic light is 60 s, the green time
allocated for right turns can accommodate a maximum of five vehicles. Determine the
probability that there will be a backup of vehicles waiting to turn right thus blocking
the lane.
Chapter 6 Solutions
Traffic and Highway Engineering
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - The arrival times of vehicles at the ticket gate...Ch. 6 - Prob. 27P
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- TRANSPORTATION 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_forwardA 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 Barrow_forwardThe southbound approach of a signalized intersection carries a flow of 1000 veh/h/ln at a velocity of 50 mi/h. The duration of the red signal indication for this approach is 15 sec. If the saturation flow is 2000 veh/h/ln with a density of 75 veh/ln, the jam density is 150 veh/mi, determine the following: a. The length of the queue at the end of the red phase b. The maximum queue length c. The time it takes for the queue to dissipate after the end of the red indication.arrow_forward
- The southbound approach of a signalized intersection carries a flow of 1000 veh/h/ln at a velocity of 50 mi/h. The duration of the red signal indication for this approach is 15 sec. If the saturation flow is 2000 veh/h/ln with a density of 75 veh/ln, the jam density is 150 veh/mi, determine the following:a. The length of the queue at the end of the red phaseb. The maximum queue lengthc. The time it takes for the queue to dissipate after the end of the red indication. What do you understand by traffic engineering? Explain.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_forwardFour-phases signal with a cycle time of 80 sec, Inter Green = 4 sec/phase, lost time / phase = 2 sec. Saturation flow on all approaches are similar, but the maximum traffic flows on two of the phases are triple the maximum traffic flows on the remaining two approaches, what will be actual green time on each phase ?arrow_forward
- c) Assume that traffic on a single-lane approach to a signalized intersection observes the Greenshield's speed-density relationship. The jam density on the approach is 180 veh/mile and free flow speed is 60mph. Suppose the current signal is green and the traffic is moving at 40mph and passing through the intersection. After the green time ends, the signal turns red and vehicle queue starts to build up. The signal keeps red for 60 seconds and turns green again. Answer the following questions: 1. How fast does the vehicle queue build up after the signal turns red? 2. How far the vehicles are queued in upstream, i.e. the maximum queue length?arrow_forwardAssume that traffic on a single-lane approach to a signalized intersection observes the Greenshield’s speed-density relationship. The jam density on the approach is 180 veh/mile and free flow speed is 60mph. Suppose the current signal is green and the traffic is moving at 40mph and passing through the intersection. After the green time ends, the signal turns red and vehicle queue starts to build up. The signal keeps red for 60 seconds and turns green again. Answer the following questions: 1. How fast does the vehicle queue build up after the signal turns red? 2. How far the vehicles are queued in upstream, i.e. the maximum queue length?arrow_forwardPROBLEM 4. A signalized intersection has a 4-phase signal with the allowed movements shown in the table below. The analysis flow and saturation flow rates are also shown in the same table. Consider an approaching speed of 20km/h and a grade of 0% and 0.5secs of all in red-time. Phase 1 2 3 4 Analysis flow rate 250, 225 veh/h 970, 1030 ve 260, 235 ve 215 veh/h Saturation flow rate 1755, 1720 veh/h 3345, 3400 veh/h 1730, 1750 veh/h 1700, 1750 veh/h Allowed movements EB L, WB L EB T/R, WB T/R SB L, SB T/R NB L, NB T/R Assumption: lost time = 4sec per phase, v/c = 0.95 Questions: Compute the level of service for the southbound approach using the minimum cycle length.arrow_forward
- A) Calculated (not rounded) clearance interval for an intersection approach of 50 mph that needs to cross 45 ft of intersection width. B) If a roadway has an AADT of 25000 vehicles, of which 2000 occur during the peak hour, what is the k factor? C) The stopped time delay for an intersection approach is 34.5 seconds. The control delay is most likely D)An intersection approach has a capacity of 1600 vph. What is the likely queue at the end of an hour if the 15 minute vehicle arrivals are 350, 500, 300, and 500? E)A roadway has a measured flow of 2400 vphpl and SMS of 60 mph, what is the density and LOS?arrow_forwardDetermine 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_forwardAn intersection has a three-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. (1) Calculate the sum of the flow ratios for the critical lane groups. (2) calculate the minimum cycle length and the effective green time for each phase (balancing v/c for the critical lane groups). Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired.arrow_forward
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