The following vehicles' speeds are measured at a location of a highway (for northbound only) over a period of 2 minutes. Calculate the flow rate in vehicles per hour (veh/hr) for this highway. Number of Vehicles Speed (mph) 1 67 2 60 3 55 4 53 5 78 6 68 7 52 8 58 9 58 10 73 11 68 12 45 Options: A. 120B. 360C. 60D. 450
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The following vehicles' speeds are measured at a location of a highway (for northbound only) over a period of 2 minutes. Calculate the flow rate in vehicles per hour (veh/hr) for this highway.
Number of Vehicles | Speed (mph) |
---|---|
1 | 67 |
2 | 60 |
3 | 55 |
4 | 53 |
5 | 78 |
6 | 68 |
7 | 52 |
8 | 58 |
9 | 58 |
10 | 73 |
11 | 68 |
12 | 45 |
Options: A. 120
B. 360
C. 60
D. 450
Step by step
Solved in 2 steps
- 1. An equation has been calibrated for the amount of time (in seconds) required to clear N vehicles through a given signal phase (N>5): T= 2.04 +2.35N a. What start-up lost time does this equation suggest? b. What saturation headway and saturation flow rate are implied by the equation? 2 The saturation flow rate for an intersection approach is 3600 veh/h. At the beginning of a cycle (effective red) no vehicles are queued. The signal is timed so that when the queue (from the continuously arriving vehicles) is 13 vehicles long, the effective green begins. If the queue dissipates 8 seconds before the end of the cycle and the cycle length is 60 seconds, what is the arrival rate, assuming D/D/1 queuing? 3 An intersection has a four-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in The table below Calculate the sum of the flow ratios for the critical lane groups. Phase Allowed movements Analysis flow rate Saturation flow rate…An expressway off-ramp consisting of a single lane leads directly to a tollbooth. The rate of arrival of vehicles at the expressway can be considered to be Poisson with a 6-24 www.Civil08.com - The Download Monster Chapter 6 Fundamental Principles of Traffic Flow 263 mean of 50 veh/h, and the rate of service to vehicles can be assumed to be exponen- tially 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 85% of the time? Assume the average length of a vehicle is 20 ft and that there is an average space of 5 ft between consecutive vehicles waiting to be served. (c) What is the average waiting time a driver waits before being served at the toll- booth (that is, the average waiting time in the queue)?The data below shows the result of the flow of traffic at a certain part of a highway by observing the arrival time times for four vehicles at two sections A and B that are 200 m apart. The total observation time at a section A is 20 sec. find the following: a.) time mean speed (kph and in 3 decimals) b.) space mean speed (kph and in 3 decimals) c.) determine the flow at section A (veh/hr and in 3decimals)
- QUESTION 13 60 10 15-min Volumes Y 75 40 Lane Configurations SUCP What is the movement capacity of the left turn from the main street if the potential capacity is 1,238 veh/h?An intersection has a three-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired. Phase 3 Allowed movements NB L, SB L NB T/R, SB T/R EB L, WB L ЕВ TR, WB TR Analy sis flow rate 330, 365 veh/h 1125, 1075 veh/h 110, 80 veb/h 250, 285 veh/h Saturation flow rate 1700, 1750 veh/h 3400, 3300 veh/h 650, 600 veh/h 1750, 1800 veh/h Calculate the sum of the flow ratios for the critical lane groups. 0.787 O 0.857 O 0.709 O 0,829Traffic data are collected between Point X and Y. Seven vehicles pass in Point X at intervals of 18, 17, 19, 28, 25, 22, and 24 sec respectively. The vehicle's speeds are 60, 50, 55, 58, 52, 49, and 30 kph respectively. Calculate the flow, density, time mean speed, and space mean speed. Determine also the length of the segment.
- For the geometric characteristics, traffic conditions (traffic volumes are in vehicles per hour) and signal timing shown below, complete parts A through E for the Northbound and Eastbound approaches. A. Adjust the volumes. B. Find the saturation flow rate. C. Find the degree of saturation. D. Find the theoretical delay for each movement. E. Find the theoretical delay and LOS for the EB and NB approaches. Bus stop 5 stops/hr $12 ft teach 6% HV 400 6% HV 650 100 12 ft each - Isolated signal with random arrivals, AT-3 - No residual demand delay 11 ft each - No bicycles or pedestrians Bus stop 5 stops/hr P C = 60 sec Lost time = 3.5 sec/ 7550 2% HV - G=42 Y=4 G=10; Y=4 G=8 Y=4 G=30 Y=4 Φ1 Φ2 ФЗ Assume the intersection is located at Central Business District (CBD) Assume that both the streets are located on level grades, i.e. G = 0 Assume a PHF = 0.95 Assume random arrival i.e. AT-3 Assume that the intersection is isolated and signal is pre-timedThere are 5 vehicles observed in a 100 m section of McArthur highway. If the average time headway is 3.6 sec., compute the space mean speed of the vehicles in kph. Answer in whole number.QUESTION 12 60 10. 15-min Volumes 75 40 Lane Configurations Y Consider the left turn movement from main street. If the conflicting flow rate is 280 veh/hr, and the critical headway, adjusted for heavy vehicles and grade, is 4.2 seconds, and the follow-up time, adjusted for grade, is 2.29 seco nds, calculate the potential capacity, Cp,4 (veh/h). Provide your answer to the nearest integer. SRCP