11. If cars pass a certain point on a highway at a mean headway of 10 seconds, the vehicle flow rate at the point is: а. 360 vph b. 480 vph с. 750 vph d. 1200 vph 12. The overall capacity of a signalized street network is predominantly limited by the capacity of its a. Links b. Intersections c. Drivers d. Trucks 13. If the peak 15 minutes of the peak hour carry 32% of the peak hour traffic, what is the corresponding peak hour factor? а. 0.84 b. 0.89 с. 0.78 d. 0.72

11. If cars pass a certain point on a highway at a mean headway of 10 seconds, the vehicle flow rate at the point is: а. 360 vph b. 480 vph с. 750 vph d. 1200 vph 12. The overall capacity of a signalized street network is predominantly limited by the capacity of its a. Links b. Intersections c. Drivers d. Trucks 13. If the peak 15 minutes of the peak hour carry 32% of the peak hour traffic, what is the corresponding peak hour factor? а. 0.84 b. 0.89 с. 0.78 d. 0.72

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Analyze the unsignalized intersection below and calculate the optimum cycle length if the intersection will be signalized. Approach E W N S Maximum no. of lanes 5 5 4 4 Direction Through left Through left Through left Through left N Total volume pcu/hr 1,480 370 860 586 1,360 494 2,030 265 Sat. flow rate pcu/hr/lane 2,400 1,700 2,400 1,700 2,200 1,800 2,200 1,800
25 The table below shows the design flow rate and saturation flow rate for a major intersection on a highway. Using the Webster method, determine the optimum cycle length for the intersection and also determine the green time for each phase. Design Flow Rate (pcu/hr) Through Phase Saturation Flow Rate (pcu/hr) Intergreen period (sec) Left Through Left A 976 234 3700 1615 3.5 676 135 3700 1615 3.5 194 26 3700 1615 3.5 322 371 3700 1615 3.5
On a six-lane EDSA, an observer is stationed at a certain spot. All of the cars in lane 1 are moving at a speed of 80 kph, 75 kph in lane 2, and 90 kph in lane 3,66 kph in lane 4,70 in lane 5, 65 in lane 6 and 85 for the bus lane respectively. In addition, cars are kept at a constant 65-meter distance between. What will be the time-mean speed and space-mean speed for such a traffic stream based on the acquired spot speed data for all cars as they cross the observation site for 60 minutes?
6. (a) Define the peak hour factor (PHF) (b) Explain the traffic condition when PHF=1. 7. The following table shows traffic flow data collected at the main road in an urban area, in two successive days during the peak period Day one Day two Time Flow (veh) Flow (veh) 7:30 – 7:45 900 7:45 – 8:00 950 960 8:00 – 8:15 1010 1015 8:15 – 8:30 990 980 (a) Determine the peak hour factor (PHF) (b) Estimate the missing traffic flow count (x) on day two.
7. The following table shows traffic flow data collected at the main road in an urban area, in two successive days during the peak period Day one Flow (veh) Day two Time Flow (veh) 7:30 – 7:45 7:45 – 8:00 900 950 960 8:00 – 8:15 1010 1015 8:15 – 8:30 990 980 (a) Determine the peak hour factor (PHF) (b) Estimate the missing traffic flow count (x) on day two.
7.24 Vehicles arrive at an approach to a pretimed signalized intersection. The arrival rate over the cycle is given by the function v(t) = 0.22 + 0.012t [v(t) is in veh/s and t is in seconds]. There are no vehicles in the queue when the cycle (effective red) begins. The cycle length is 60 seconds and the saturation flow rate is 3600 veh/h. Determine the effective green and red times that will allow the queue to clear exactly at the end of the cycle (the end of the effective green), and determine the total vehicle delay for this approach over the cycle (assuming D/D/1 queuing).
An observer notes that an approach to a pretimed signal, the time it will take the queue to clear after the start of the effective green (assuming that approach capacity exceeds arrivals and D/D/1 queuing applies) is 60 s. If the saturation flow rate is 1440 veh/h and the effective red time is 40 seconds, what is the maximum number of vehicles in a queue in a given cycle?
Question 4 Vehicles begin to arrive at a border gate at 06h50 with a deterministic arrival rate of λ (t) = 5.2 - 0.01t (λ is in vehicles per minute and t in minutes after 06h50). However, the gate opens at 07h00 and serves vehicles at a rate of μµ(t) =3.3 + 2.4t (with t in minutes after 07h00 and u in vehicles per minute). Once the service rate reaches 10 vehicles per minute, it stays at that level for the rest of the day. ● ● Illustrate the operational characteristics of the vehicle queue-delay on a (cumulative) vehicle-Time graph. When will the queue that forms be dissipated? What will be the maximum queue length? Determine the total delay.
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?
A) The following traffic counts were taken on a rural highway during the morning peak hour at (9:00-10:00 am) on Saturday of a week. Time periods (minute) Number of vehicles Find: 9:00-9:30 AM 412 9:30-9:45 AM 702 9:45-10:00 AM 254 1. The hourly volume, the peak rate of flow within the hour, and the peak hour factor. 2. The daily volume for Saturday if the hourly expansion factor (HEF) is 14. B) At a highway segment, six vehicles travel the same distance of 20 miles during 21, 25, 30, 29, 31, and 25 minutes, respectively. These vehicles have stopped at a check points for about 5 minutes. Find the average running and overall travel speeds. C) A parking garage located in Misan city center opens its doors to serve 350 vehicles from 8 am to 3 pm. An analysis of data collected at the parking site indicates that these vehicles are parked for an average of 1.5 hours. If parking efficiency is 0.9, determine the number of additional spaces needs when the number of space-hours increases by 16%.
Through the Walla Walla Road to the entrance of the E-1 parking lot at the University of Washington, vehicles begin to arrive from 7:40 A.M. at a uniform deterministic rate of 480 vph until 8:20 A.M. and from then on at 120 vph. It takes 10 seconds for a vehicle to go through the paying process at the gate. If the parking lot is open at 8:00 A.M., determine (a) when the queue will dissipate, (b) the total delay, (c) the average delay, (d) the maximum queue length (in vehicles), and (e) the longest vehicle delay under FIFO. Show your results graphically. [Hint: D/D/1 analysis]
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.