Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Chapter 13, Problem 24P
To determine
If the new carpool lane is successful or if the lane should be open to all traffic.
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Scheduled maintenance will close two of the four westbound lanes of a freeway during one weekday for the period from 9:00 AM to 4:00 PM. The demand on the two lanes are as follows:
Time Demand, vph
9:00-10:00 AM 4000
10:00-11:00 AM 3500
11:00-12:00 NN 2500
12:00-1:00 PM 2000
1:00-2:00 PM 2000
2:00-3:00 PM 2000
3:00-4:00 PM 2000
If the estimated capacity of the 4 lanes with 2 lanes open is 2960 vph,
a. compute the time when maximum queue occurs. 11:00 AM
b. compute the maximum queue formed. 1580 vehicles
c. compute the maximum length of queue if the average length of cars is equal to 5 meters. 1975 m
Show all necessary diagrams and solutions.
On a given day, 425 vehicles per hour arrive at the tollbooth located at the end of an off-ramp of
the South Superhighway. If the vehicles can be serviced by only a single channel at the service
rate of 625 vehicles per hour, determine the average number of vehicles in the system.
An expressway consists of four lanes, where the capacity per lane is 2500 vehicles. In normal days, 6500 vehicles pass. However, there is an emergency road repair conducted in which two lanes will be closed. The repair lasted 150 minutes. Calculate the maximum queue length, total length, and number of vehicles impacted by the event, and average individual delay.
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Traffic and Highway Engineering - With Mindtap
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- Vehicles arrived at the entrance of San Juanico Bridge in Tacloban at a rate of 180 vehicles per hour. Vehicles must stop at the tollgate where vehicles will have to pay a toll fee upon entering the bridge. It would take 15seconds per vehicle for the attendant to issue a trip ticket. Compute the traffic intensity at the bridge.arrow_forward2. There are two routes in use between Zones 1 and 2. The volume-delay functions for the two routes are as follows: V1 V2 t1 = 22 + 250 t2 = 15 + 150 where t = travel time(minutes) V = traffic volume If the total traffic volume is 6,950 vehicles per hour between the two zones, what are the traffic volumes and travel times on each of the two routes at a user-equilibrium (UE) condition?arrow_forwardConsider the freeway and traffic conditions described in Problem 6.3. If 180 of the 1800 vehicles observed in the peak hour were large trucks and buses, what would the level of service of this freeway be on a 5-mi, 6% downgrade?arrow_forward
- A freeway with two northbound lanes is shut down because of an accident. At the time of theaccident, the traffic flow rate is 1200 vehicles per hour per lane and the flow remains at this level.The capacity of the freeway is 2200 vehicles per hour per lane when not impacted by an accident.The freeway is shut down completely for 20 minutes after the accident and then one lane is openfor 20 minutes and finally both lanes are opened (40 minutes after the accident). What is theaverage delay per vehicle resulting from the accident (assuming D/D/1 queuing)?arrow_forwardA traffic engineer has set up a one-mile study segment of a corridor. He measures the speed of 10 vehicles. Calculate the space mean speed and time mean speed of these vehicles. If the space mean speed occurs at an optimal flow with a density of 75 veh/mi, what is the capacity of this roadway?arrow_forwardAn incident occurs on a freeway that has a capacity in the north bound direction, before incident, of 4000 veh/h and a constant flow of 2900 veh/h during the morning commute (no adjustments to traffic flow result from the incident). At 8:00am, a vehicle crash closes the freeway to all traffic. At 8:12am, the freeway is partially opened with a capacity of 2000 veh/h. Finally, the crash site is removed and the freeway is restored to full capacity of 4000 veh/h at 8:31am. Assuming the traffic follows a D/D/1 queueing (FIFO queue discipline) to determine time of queue dissipation, longest queue length, total delay, average delay per vehicle, and longest wait of any vehicle.arrow_forward
- The T-intersection has 1,539 collision incidents over the last 7 years. The annual daily traffic is 53,155 veh/day. Determine the accident rate of the intersection per MEV Express your answer in 2 decimal places.arrow_forwardfreeway with two northbound lanes is shut down because of an accident. At the time of the accident, the traffic flow rate is 1200 vehicles per hour per lane and the flow remains at this level. The capacity of the freeway is 2200 vehicles per hour per lane when not impacted by an accident. The freeway is shut down completely for 20 minutes after the accident; then one lane is opened 20 minutes after accident; and finally both lanes are opened 40 minutes after the accident. What is the total delay resulting from the accident (assuming D/D/1 queuing)?arrow_forwardThe number of vehicles that can enter the on-ramp of Subic-Clark Expressway is controlled by a metering system. If the vehicles can enter the expressway at a rate of 500 veh/hr, and the rate of arrival of the vehicles at the on-ramp is 400 veh/hr during the peak hour. Determine the expected number of units waiting to be served in the system.arrow_forward
- You are designing a freeway as a passenger-car only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75.000 vehicles per day, a free-flow speed of 70 mi/h, a traffic stream of primarily commuters, a peak-hour factor of 0.88 and a directional distribution of 0.65. Determine the number of lanes (both directions) required to provide at least level of service D using the 30th highest annual hourly volume (K30+ 0.12). The answer is a number of lane freeway.arrow_forwardVehicles arrive at the entrance of the new extension of NLEX. There is a single toll gate at which all vehicles must stop where a toll attendant distribute a trip ticket. The toll opens at 6:00AM at which vehicles begin to arrive at the rate of 8 vehicles per minute. After 20 minutes, the arrival flow rate declines to 2 vehicles per minute and it continues at that level for the remainder of the day. If the time required to distribute the trip ticket is 15 seconds, determine the time the queue dissipates.arrow_forwardDuring peak hours, 3800 vehicles pass through a certain highway from 9:00 am to 11:00 am, with space mean speed of 20kph. What is the average space headway per vehicle in meters?arrow_forward
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