Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 4, Problem 16P
To determine
How travel time and delay studies are used and one method for collecting travel time and delay data at a section of a highway and how the given information is obtained from the data collected
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How are travel time and delay studies used? describe one method for collecting travel time and delay at a station of a highway. Expain how to obtain the following information collected
a. Travel time
b. Operational delay
c. Stopped time delay
d. Fixed delay and
e. Travel time delay
The results of the travel time study are summarized in the following table. For this data:
a. Tabulate and graphically present travel time and delay results.
b. Show the average travel speed and average running speed for each section.
To study congestion in the core of a city, a survey measured traffic volume at a busy intersection between the hours of 1300 and 1600.
Describe the bias that could influence the results of this survey.
Suggest ways in which the survey could be redesigned to reduce the possibility of bias.
Chapter 4 Solutions
Traffic and Highway Engineering
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- TRAVEL TIME AND DELAY STUDIES • The shows data obtained in a travel time study on a section of highway using the moving-vehicle technique. Estimate (a) the travel time and (b) the volume in each direction at this section of the highway Run Direction/ Number Northward 2 4 5 6 7 8 9 10 Southward 3 4 6 7 8 9 10 No. of Vehicles Travel Traveling in Time Opposite Direction (min) 5.25 5.08 5.30 5.15 5.00 5.51 5.38 5.41 5.12 5.31 4.95 4.85 5.00 4.91 4.63 5.11 4.83 4.91 4.95 4.83 100 105 103 110 101 98 97 112 109 107 85 88 95 100 102 90 95 96 98 90 PARKING STUDIES No. of Vehicles That Overtook Test Vehicle 3 1 0 1 3 0 1 0 0 2 1 1 No. of Vehicles Overtaken by Test Vehicle 2 1 1 0 3 1 0 1 2 PROB 1. Data collected at a parking lot indicate that a total of 300 cars park between 8 a.m. and 6 p.m. 10% of these cars are parked for an average of 2 hr, 30% for an average of 4 hr, and the remaining cars are parked for an average of 10 hr. Determine the space-hours of demand at the lot PROB 2. If 10% of…arrow_forwardThe results of a traffic study is given in the form of a frequency distribution table. Speed Range Frequency 2 5 1 8 2-6 7-11 12 - 14 15 - 19 The ratio of time mean speed to space mean speed isarrow_forwardVehicle arrivals in an event are assumed Poisson distributed with an average arrival rate of (15.4) vehicles in every 2 minutes. What is the probability of the following: a. Exactly 14 vehicles arrive in a 2.5-minute interval. b. Less than 14 vehicles arrive in a 2.5-minute interval. c. More than 14 vehicles arrive in a 2.5-minute interval.arrow_forward
- Road Safety According to accident statistics of a certain town over the last three years, the ten intersections having the highest number of accidents are shown in the table below together with the corresponding number of accidents and the total entering vehicles for each intersection. Identify the intersections that may be con sidered hazardous, using 95% level of confidence. Intersection No. Number of Accidents Daily Entering Vehicles 243 15,900 18,300 24,000 13,600 14,200 1. 2. 220 3 310 4. 210 239 17,120 13,700 19,300 47,900 17,100 6. 250 188 8 360 9. 350 10 370arrow_forwardd. Different types of traffic counts are carried out, depending on the data's anticipated use to be collected. Select and describe the method and equipment you will recommend for traffic volume counts for each road below. Give reasons for your recommendations. 1. A private road leading to an industrial development 2. A residential street 3. A rural collector road 4. A section of an interstate highwayarrow_forwardQuestion 3 In which of the following scenarios using traffic simulation is more helpful than data-driven predictive models? A. Understanding the impact of road occupancy license (ROL) type of works on the traffic of the surrounding road network B. Estimating the hourly traffic speed and volume under normal traffic conditions C. Proposing alternative route options for vehicles after an incident occurs on a high demand road A Both A and C Oarrow_forward
- Consider the following plot of cumulative arriving and departing vehicles at a freeway bottleneck location: Vehicles 20,000 15,000 10,000 5,000 0 0 30 60 90 120 150 180 210 240 270 300 330 360 Time (mins) Arrivals (vehs) Departures (vehs) From this plot, determine the following: A. What is the capacity of the bottleneck location? 9000 whole number, i.e. X000.) B. What is the maximum size of the queue that develops? 3250 whole number, i.e. X000.) C. What is the longest wait time that any vehicle experiences during the breakdown? to the nearest whole number, i.e. XX.) (Hint: Provide the answer as a numerical number only in units of vehicles per hour and rounded to the nearest thousand (Hint: Provide the answer as a numerical number only in units of vehicles and rounded to the nearest thousand (Hint: Provide the answer as a numerical number only in units of minutes and roundedarrow_forwardA ramp meter operates during the morning peak period. Ramp meter cycles vary with time as shown in the table. The metering scheme allows one vehicle to pass the signal. The table below gives the number of vehicles demanding service on the ramp during the particular time intervals, the cumulative demand for the ramp for the morning peak, the ram meter cycle for each interval. Using a queuing diagram, determine the maximum queue, the maximum delay to any vehicle, and the total delay in the system. draw a figure.arrow_forwardAssume vehicle arrivals are random. On average, six vehicles arrive in one minute. Calculate theprobability of observing less than three vehicles over three minutes. Calculate the probability ofobserving a headway of less than eight seconds.arrow_forward
- The following travel times were observed for five vehicles traveling a one mile segment of a highway project. It is required to estimate the time mean speed of these vehicles in miles per minute. Vehicle Time (min) A 1.19 1.22 1.36 1.48 1.51arrow_forwardTraffic data are collected in 60-second intervals at a specific highway location as shown in the Table. Assuming the traffic arrivals are Poisson distributed and continue at the same rate as that observed in the 15 time periods shown, what is the probability that six or more vehicles will arrive in each of the next three 60-second time intervals (12:15 P.M. to 12:16 P.M., 12:16 P.M. to 12:17 P.M., and 12:17 P.M. to 12:18 P.M.)?arrow_forward7. 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.arrow_forward
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