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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Studies have shown that the traffic flow on a single-lane approach to a signalized intersection can be described by the Greenshields model. If the jam density on the approach is 130 veh/mi, determine the velocity of the stopping wave when the approach signal changes to red if the density on the approach is 45 veh/mi and the space mean speed is 40 mi/h. At the end of the red interval, what length of the approach upstream from the stop line will vehicles be affected if the red interval is 35 sec?
Studies have shown that the traffic flow on a single-lane approach to a signalized intersection can be described by the Greenshields model. If the jam density on the approach is 130 veh/mi, determine the velocity of the stopping wave when the approach signal changes to red if the density on the approach is 45 veh/mi and the space mean speed is 40 mi/h. At the end of the red interval, what length of the approach upstream from the stop line will vehicles be affected if the red interval is 35 sec?Draw a figure.
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.
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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- In a given instant, there were 2400 vehicles counted at a specific point along the portion of the TPLEX. The highway was designed to have a capacity of 3000 veh/hr with a free-flow speed of 60 kph. Compute the maximum value of the jam density in veh/km that could possibly occur during heavy traffic assuming linear speed-density relationship applies.arrow_forwardThe jam density on the approach of the traffic flow on a single lane of Juan Luna St. is 120 veh/km, with a density on the approach of 40 veh/km. If the space-mean speed is 40 kph, determine the free-flow speed in kph.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_forward
- Vehicles are approaching east of a stop signal traveling at 56 km/h, with a density of 46 vehicles/km/lane. The duration of the red signal indication for this approach is 30 seconds. If the saturation flow is 1900 vehicles/hr/lane with a density of 52 vehicles/km/lane and the congestion density is 125 vehicles/km/lane, determine the length of the queue at the end of the red phase. Assume the ShockWave model for the respective analysis.arrow_forwardA) 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_forwardAn approach to a pretimed signal has 32 seconds of effective green, a saturation flow rate of 1800 veh/h, and a volume-to-capacity ratio less than 1. If the cycle length is 115 seconds and the overall delay formula (Eq. 7.27) estimates an average delay that is 38 seconds greater than that estimated by using just the uniform delay formula, determine the vehicle arrival rate in veh/h. (Assume the signal is isolated and d_3 = 0.arrow_forward
- There are 9 vehicles observed in a 300 m section of McArthur highway. If the average time headway is 4 sec., compute the space mean speed of the vehicles in kph.arrow_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 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_forwardAnswer 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_forward
- A two-lane minor road intersects a two-lane undivided major road at 90 degrees, forming a four-leg intersection with traffic on the minor road controlled by a yield sign. A building is located 50 m from the center line of the outside lane of the major road and 14 m from the center line of the nearest lane of the minor road. A passenger car on the minor road would like to cross the major road. Using the AASHTO procedure, determine the maximum speed that can be allowed on the minor road if the design speed on the major road is 80 km/h. Assume a 3% approach grade for the minor road. Note: 1km/hr = 0.62mi/h, 1ft = 0.3048marrow_forwardplz, solve this problem, it is not graded question. Transportation Engineering-1 During a 70 sec period, a detector is occupied by vehicles for the following times: 0.31, 0.39, 0.41, 0.35, and 0.53 sec. Estimate the values of flow (q), density (k) and speed (v). Assume that the loop detector is 10 ft and that that the average length of the vehicle is 20 ft.arrow_forwardBy assuming a linear speed-density relationship, the mean free speed on a highway facility lane equals 55 mph near zero density, and the jam density is observed to be about 170 veh/mi. Write down the speed-density and flow-density equations. Plot the q-v curves in proper order. Compute speeds and densities corresponding to a flow of 900 veh/hr, describing traffic conditions from a driver's point of view. Calculate average headways, gaps, clearance, and spacing at maximum flow and at jam density. Discuss all the results you obtain. Are they realistic?arrow_forward
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