Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 8, Problem 10P
To determine
The amount of commercial space added in shopping center 2 to attract similar number of trip at a time of congestion.
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hree routes connect an origin and a destination with performance functions: ?1=8+0.5?1; ?2=1+2?2; and ?3=3+0.75?3; with the x’s being the traffic volume expressed in thousands of vehicles per hour and t’s being the travel time expressed in minutes. If the peak hour traffic demand is 3400 vehicles, determine user equilibrium traffic flows. [Hint: Note that one of the paths will not be used under the equilibrium condition
The average queue length at the intersection of the two roads with a stop signs is 4 vehicles. If the arrival rate of vehicles at the stop sign is 300 vehicles per hour, determine the service rate of the road in vehicles per hour. Assume both arrival and departure rates are exponentially distributed.
A separate trip generation analysis has predicted 800 peak-hour trips for grocery shopping in this area. Given two possible stores, distribute these trips among stores and auto or bus mode.
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Principles of Highway Engineering and Traffic Analysi (NEW!!)
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- Please solve this question. Subject: Transportation engineering 1 mum safety margin is 15 ft, centerline radius is 150 ft). Problem No.3 Space Requirements for a Parking Garage The owner of a parking garage located in a CBD has observed that 22 percent of those wishing to park are turned back every day during the open hours 8 a.m. to 6 p.m. because of a lack of parking spaces. An analysis of data collected at the garage indicates that 65 percent of those who park are commuters, with an average parking duration of 9 hours, and the remaining percentage are shoppers, whose average parking duration is 2 hours. If 25 percent of those who cannot park are commuters and the rest are shoppers, and a total of 220 vehicles currently park daily in the garage (i.e. parking spaces are 220), determine the number of additional spaces required to meet the excess demand. Assume parking efficiency is 0.90.arrow_forward8.21 Three routes connect an origin and destination with performance functions t₁ = 2 +0.5x₁,₂ = 1 + x2 and 13 = 4 + 0.2x, (with f's in minutes and x's in thousands of vehicles per hour). Determine user- equilibrium flows if the total origin-to-destination demand is (a) 5000 veh/h.arrow_forwardDuring peak hours, 3800 vehicles pass through a certain highway from 9:00 AM to 11:00 AM, withspace mean speed of 20 kph. What is the average space headway per vehicle in meters? Hint:space headway is related to the densityarrow_forward
- Two routes are available to carry 1200 vehicles in peak-hour traffic. Route 1 has a posted speed limit of 45 mph and is 5 miles long. The travel time increases by 2x2, where x is vehicles in thousands. Route 2 has a limit of 55 mph and is 6.7 miles long, and the travel time increases by 1.5x. Find the user-equilibrium travel flow and travel time.arrow_forwardA certain single lane/on-ramp highway was estimated to have a utilization ratio of 0.893. The rate of arrival of vehicles follows a negative exponential distribution with an average of 296 vehicles per hour. If the service rate is also known to be stochastic, a.Compute the service rate in vehicles/hr. b.Compute the average waiting time at the stop sign per vehicle in seconds. c.Compute the average time spent in the system in seconds.arrow_forwardThree routes connect an origin-destination pair with performance functions:t₁ = 20 +0.5x1t2 = 4+ 2x2t3=3+0.2x3with t in minutes and x in thousand vehicles per hour.(a) Determine the User Equilibrium flow on each route if q = 4000veh/h. (b) What is the minimum q (origin-destination demand) to ensure that all the three routes are used under user equilibrium? (c) Suppose that Route 1 is closed for repair. Find the system optimal flow on routes 2 and 3 and compute the total travel times.arrow_forward
- 1) During morning peak hour, the average headway of UP-Katipunan jeepneys is estimated at 5 minutes. If the passenger demand during the same period is 240, determine whether there is a need to increase the number of jeepney units (or shorten the headway) for this route. Assume that passenger demand is evenly distributed within that period and the average load/occupancy is 14 passengers per jeepney. 2) During heavy traffic congestion, it was observed that the average spacing of vehicles in queue in the innermost lane in EDSA is 6.5m. Determine the jam density or density of stopped vehicles.arrow_forwardCalculate the annual monetary benefit ($ from travel time/delay savings) for an intersection improvement project that reduces average delay by 3.7 sec/veh given the following information:· Average hourly wage in the city is $24.80· Assume 60% of salary for value of travel time savings· Assume 1.65 persons per vehicle· Average Daily Traffic for this intersection is 21,500 vehicles per dayarrow_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
- [T] The following table provides hypothetical data regarding the level of service for a certain highway. Plot vehicles per hour per lane on the x-axis and highway speed on the y-axis. Compute the average decrease in speed (in miles per hour) per unit increase in congestion (vehicles per hour per lane) as the latter increases from 600 to 1000, from 1000 to 1500, and from 1500 to 2100. Does the decrease in miles per hour depend linearly on the increase in vehicles per hour per lane? Plot minutes per mile (60 times the reciprocal of miles per hour) as a function of vehicles per hour per lane. Is this function linear? Highway Speed Vehicles per Hour per Lane Density Range (vehicles / mi) > 60 < 600 < 10 60 - 57 600 - 1000 10 - 20 57 - 54 1000 - 1500 20 - 30 54 - 46 1500 - 1900 30 - 45 46 - 30 1900 - 2100 45 - 70 < 30 Unstable 70 - 200arrow_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_forwardA 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_forward
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