5. A traffic accident occurred along the North Diversion road at 6:00 AM. The flow rate on the expressway at this time of day was 53 rehicles per min. The normal freeway capacity is 75 vehicles per ninute but it was reduced to 21 vehicles per minute due to the traffic accident. The traffic was cleared by the MMDA after an hour minutes. ) Determine the max. length of the queue before the blockage was emoved 3) Determine the time that the vehicles waited for the long queue efore the blockage was cleared C) What time was the queue cleared?

5. A traffic accident occurred along the North Diversion road at 6:00 AM. The flow rate on the expressway at this time of day was 53 rehicles per min. The normal freeway capacity is 75 vehicles per ninute but it was reduced to 21 vehicles per minute due to the traffic accident. The traffic was cleared by the MMDA after an hour minutes. ) Determine the max. length of the queue before the blockage was emoved 3) Determine the time that the vehicles waited for the long queue efore the blockage was cleared C) What time was the queue cleared?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter6: Fundamental Principles Of Traffic Flow

Section: Chapter Questions

Problem 20P

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2cb) The average speed of a 1st group of vehicles over a road msegment is per 45 km/h and their flow is 1350 vehicles hour. The average speed of a 2nd group of vehicles over the same segment is 40 km/h and their flow is 1800 hour. Determine the maximum flow of the vehicles per whole traffic stream? Wat mumiyan to booge all
A Four Lane freeway is located on rolling terrain with a free flow speed of 70 mph,12ft lanes, and no lateral obstructions within 8 ft of the pavement edges. the traffic stream consists of cars, buses and large trucks (no recreational vehicles) . A weekend directional peak hour volume of 1800 vehicles (*regular users*)is observed ,with 700 arriving in the mostly congested 15 minutes period . if a level of service no worse than C is required ,determine the maximum number of large trucks and buses that can be present in the peak hour traffic stream.. Dislike for wrong answers
2. Congestion starts at 6am in an expressway. Survey found out that an average of 600vph entered the expressway for the 1* 30minutes, reduced to 250vph and remain constant for the succeeding hours. The booth teller took approximately 10sec to render its service for every vehicle. a. Determine the time of dissipation b. Calculate the total number of vehicles entered for this duration Determine the queue and delay after 45mins from the start of rush hour d. Calculate the delay experienced by the 100th vehicle C.
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.
A segment of eight-lane urban freeway experiences a breakdown that blocks two lanes completely for a period of one hour in the peak direction. The breakdown occurs at 9:00 AM and is cleared by 10:00 AM. The capacity of the segment is 2,100 veh/h/In, with a maximum queue discharge rate of 1,800 veh/h/ln. Beginning at 9 AM, the traffic demand at this location is: 9:00 AM-10:00 AM 8,400 veh/h 10:00 AM-11:00 AM 8,000 veh/h 11:00 AM-12:00 Noon 7,000 veh/h After 12:00 Noon 6,000 veh/h 1. What is the maximum queue size that will form in this scenario? 2. At what time does the stable capacity value resume?
The rate of arrival of vehicles at the expressway can be considered to be Poisson with a mean of 45 veh/hr, and the rate of service to vehicles can be assumed to be exponentially distributed with a mean of 1 min. (a) What is the average number of vehicles waiting to be served at the booth (that is, the number of vehicles in queue, not including the vehicle being served)? (b) What is the length of the ramp required to provide storage for all exiting vehicles 90% of the time? Assume the average length of a vehicle is 18 ft and that there is an average space of 10 ft between consecutive vehicles waiting to be served. (c) What is the average waiting time a driver waits before being served at the tollbooth (that is, the average waiting time in the queue)?
Example 3 Because of a minor collision, one of the two SB lanes on a freeway is blocked at 8:13am. The normal freeway capacity of 3600 vph is reduced to 1340 vph. The SB flow rate at this time of day is 2715 vph. The blockage is removed after 15 minutes. - Find the maximum queue length Maximum time spent in queue - - - Time of queue dissipation - Total delay -
A)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? B) What is the cumulative lost time per hour if the lost time per phase is 4 seconds and the intersection operates as a 4 phase 120 second cycle? C) A queue of 200 veh. is built up waiting to get into a national park prior to open. How long it will take to clear the queue if each vehicle takes 15 seconds, yet veh. continue to arrive at 60 vph? D) The allocated effective green time across 3 phases if critical volumes are 300, 200 and 100 vehicles respectively if you have a 75 second cycle. Assume Y+AR = tl = 5 sec/ phase. E) A roadway has an estimated density of 50 vpmpl. What percent of time is a highway detector covered if the detector is 5 ft long? Assume 28 ft veh length.
The minimum cycle length for an intersection is determined to be 95 seconds. The cirtical lane group flow ratios were calculated as 0.235, 0.250, 0.170 and 0.125 for phases 1- 4 respectively. What Xc was used in the determination of this cycle length, assuming a lost time of 5 seconds per phase?
Eight lane urban freeway is on level terrain with lane width of 12 ft, right shoulder lateral clearance of 4 ft, and 12 ramps over the 6-mi analysis segment. The traffic stream consists of unfamiliar road users. Peak hour volume for a directional weekday of 3200 vehicles is observed with 900 vehicles arriving in the most congested 15-min period. If the traffic stream has 20% large trucks and 20% buses and 15% recreational vehicles, determine the exact demand flow rate (in pc/h/In). Round your answer to 3 decimal places. Exclude the unit in the answer box.
1) A 6-lane two-way arterial road has a maximum flow of 6,000 vehicles per hour on one direction. It is operating at 3,600 vehicles per hour at time, t=0. A collision occurs, blocking the two lanes, and restricting the flow of the outermostlane to 1,600 vehicles per hour. After 40minutes, the police have cleared the middlelane from accident debris; the operating volume at that time increased to 2,400 vehicles per hour.20 minutes past, the innermost lane was finally cleared of the accident. Traffic returns to normalas soon as the queue has already immoderate. a.Determine the maximum length of queue that occurred. b.How long did it take to dissipate the queue? c.If a vehicle entered the road at t=10 minutes, how long will it take for it to leave the traffic?
Consider 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?