4. Route 1 has a free flow travel time of 10 minutes and the average travel time on this route increases by 3 minutes for every vehicle increase and Route 2 has a free flow travel time of 15 minutes and its average travel time increases by 2 minutes for every vehicle increase. Compare the results for UE and SO conditions with a flow rate is 12 veh/hr, determine the ff: Travel times on each route Traffic volumes on each route Total system travel time ■ I ■

4. Route 1 has a free flow travel time of 10 minutes and the average travel time on this route increases by 3 minutes for every vehicle increase and Route 2 has a free flow travel time of 15 minutes and its average travel time increases by 2 minutes for every vehicle increase. Compare the results for UE and SO conditions with a flow rate is 12 veh/hr, determine the ff: Travel times on each route Traffic volumes on each route Total system travel time ■ I ■

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter13: Evaluating Transportation Alternatives

Section: Chapter Questions

Problem 4P

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Two routes connect an origin and a destination and the flow is 15000 veh/h. Route 1 has a performance function t1=4+3*x1, and route 2 has a function of t2=b+6*x2, with the x's expressed in thousands of vehicles per hour and the t's in minutes. (a) If the user equilibrium flow on route 1 is 9780 veh/h, determine the free-flow speed on route 2(i.e. b) and equilibrium travel times. (b) If population declines reduce the number of travelers at the origin and the total origin-destination flow is reduced to 7000 veh/h, determine user equilibrium travel times and flows.
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)?
8.21 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.
road construction The 20-year projection of annual average daily traffic of a two-way roadway is 36.500 vehicles. Theroad serves as a highway between a residential area and a business area and the expected directionaldistribution factor is D=0.6. The 30th peak hour factor for the roadway is K=0.15. During an hourly vehiclecount, the following values were registered: 1st 15 minutes: 200 cars, 2nd 15 minutes: 130 cars, 3rd 15minute 230 cars, 4th 15 minutes. 180 cars. Estimate the peak hour factor . What is the designdirectional hourly volume for this route?
From the following data of a freeway surveillance, there are 4 vehicles counted for a length of 200 m and the following distances each had travelled when observed on the photographs taken every 3 seconds apart. Compute the following:i. Density of flow in vehicles per km (vpk). ii. Space mean speed in kph. iii. Flow rate, in vehicles per hour. SHOW COMPLETE SOLUTION. NEED ASAP. THNAK YOU
2.) Daily Traffic Expansion Factors A student measured the traffic volume of a rural primary road for five hours on a Wednesday for a project. The data is summarized below: Time Volume 7:00 – 8:00 AM 200 8:00 – 9:00 AM 325 9:00 – 10:00 AM 410 10:00 – 11:00 AM 503 11:00 – 12:00 AM 385 a) Determine the 24-hour volume for that day. Unit: veh. /day b) Determine the average daily traffic for the week unit: veh. /day Listed/Shown in the images are the expansion factors given.
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.
A 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.
Traffic flow in an urban section at the intersection of two highways in the design year are given below. Appr Left turning Straight ahead Right turning oach Cars Commer Scoot Cars Comm cial ers ercial Scoot Cars Comm ers ercial Scoot ers N 200 50 100 250 100 150 150 5 50 80 E 180 60 80 220 50 120 200 40 120 S 250 80 100 150 50 90 160 70 90 W 220 50 120 180 60 100 250 60 100 The highways at present intersect at right angles and have a carriageway width of 15 m. Design a rotary intersection making suitable assumptions.
7. The following are the tabulation of the coverage count of the average daily traffic on a monthly and weekly basis made with automatic traffic counts on a highway. Use the tables to calculate;(a) the ADT for February and October based on 2 days counts: (i) on Tuesday in February the daily counts were 250 vehicles and (ii) on Friday in October, the daily traffic volume was 300 vehicles. (b) the AADT if the flows counted on Friday, Saturday and Sunday in July were 8000, 6000 and 5000 vehicles on a 16 hourly count basis.(c) the seven day 16 hourly flow in September.
For this exercise, you are to design a roadway that is to carry 100,000 people a day (excluding truck occupants) – 50,000 in design direction. The vehicles that carry these people include; (1) personal vehicles (average occupancy of 1.2 people per car) 2-2 kip single axles, and (2) buses with 2-22 kip single axles (assume they are filled with an average of 40 passengers). There are also trucks on the roadway and all trucks have 1-40 kip triple axle, 1-32 kip tandem axle, and 1-8 kip single axle. You know that the soil CBR is 6, the initial PSI is 4.5 and the TSI is 2.5. Other values to be used:  All drainage coefficients = 1.0  Reliability = 90%  Overall standard deviation of traffic = 0.50  Concrete Modulus of Elasticity = 5.5 million lb/in2  Concrete Modulus of Rupture = 750 lb/in2  PCC load transfer coefficient = 3.0 Design a rigid and flexible pavement, to last 15 years, for a four-lane road (four lanes in design direction) with 400 trucks per day in the design direction, and…
Question. 2Propagation speed of 45 km/hr and that each toll booth takes 6 seconds to service a car.Suppose the caravan of 10 cars begins immediately in front of the first toll booth, travels 20 km to a second toll booth, then another 40 km to a third toll booth, and finally stops immediately after the third tool booth. Thus, they travel a total of 60 km. What is the total end to-end delay?