Traffic And Highway Engineering
5th Edition
ISBN: 9781337631020
Author: Garber, Nicholas J.
Publisher: Cengage,
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Chapter 4, Problem 7P
To determine
Whether the engineer can conclude that the average speed of large trucks is the same as for passenger cars.
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Students have asked these similar questions
Question: A section of highway is known to have a free-flow speed of 55 mph and a
capacity of 3300 veh/hr. In a given hour, 2100 vehicles were counted at a specified
point along this highway section under uncongested conditions. If the linear speed-
density relationship applies, what would you estimate the space-mean speed of these
2100 vehicles to be? Show all the calculation steps.
Consider only a single lane of a highway. Based on extensive data from an urban freeway it is assumed thatfree-flow speeds (i.e., there are no jams) can best be represented by a Normal distribution with mean andstandard deviation 119 km/h and 13.1 km/h, respectively.1. What is the probability that the speed of a randomly selected vehicle is between 100 and 120 km/h?2. What is the expected number of vehicles between two vehicles that exceed the posted speed limit of100 Km/h?
You can use the Z table for calculating the final answer. You can also write your final answer in form ofR functions or as PDF/CDF of statistical distributions with correct arguments.
Question 3:
(a) A section of highway is known to have a free-flow speed of 95 km/h and a capacity of 3300
veh/h. Your summer student indicates that the average time in between passing vehicles was 1.6
seconds during an hour of monitoring.
If the linear speed-density relationship applies, what was the space-mean speed of the vehicles
during the hour of monitoring?
Chapter 4 Solutions
Traffic And Highway Engineering
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- Considering linear relationship between density and speed; you are required to estimate the corresponding flow and speed values to densities of 10, 20, 30, 40, 50, 60 and 70 vehicle/km if the free flow speed is 90 km/hr and at critical situation, it is founded that there are 110 vehicles on a section of road with length 2.0 km. using the estimated values, draw a sketch showing the speed flow - density relationships?arrow_forwardQuestion 2: A student safety advocacy group believes that drivers are speeding down Manhattan College Blvd. To prove their point, they wish to college vehicle speed data. Previous research has shown that the standard deviation of vehicle speeds on this functional class of roads is 7.00 mph. A. How many vehicles will the group need to sample to determine the 50 percentile speed if they wish to be 95.5% confident in their results plus or minus 3.00 mph? B. How does the 50“ percentile required sample size change if we are concerned about the 85" percentile? C. How does the 50" percentile required sample change if we want the results to be accurate to plus or minus 1.5 mph?arrow_forwardSITUATION 3: According to the Department of Transportation the following data are gathered on a 20-mile long expressway for a period of 120 days. YEAR AVERAGE DAILY TRAFFIC NUMBER OF ACCIDENTS 2010 2753 100 2011 1857 120 2012 1875 95 2013 2548 115 2014 1995 135 2015 2354 150 2016 2158 85 a. Determine in which year has the lowest accident rate per million entering vehicle. b. Determine in which year has the highest accident rate per million entering vehicle. c. Determine the total accident rate per million entering vehicle. d. In what number of accidents will lower the accident rate per million entering vehicles to 50%. e. If the length of expressway considered is shorten to 10- miles and the N=1 year. Determine the accident rate per million entering vehicle.arrow_forward
- Suppose that a crash occurs on a two lane highway, blocking one lane for 45 minutes and dropping the capacity of the other lane by 70% for the same time period. After 45 minutes, the crash and emergency vehicles are cleared from the road and capacity of each lane returns to its normal value of 2000 vehicles/hour/lane. If vehicles approach the section at a rate of 2500 vehicles/hour and the queuing system can be assumed to be D/D/1: What is the length of the longest queue? vehicles How many minutes after the crash occurs does the queue clear? minutesarrow_forwardA section of a highway is known to have a free-flow speed of 65 mi/h and a capacity of 3500veh/h. In a given hour, 2500 vehicles were counted at a specified point along this highway section. If the linear speed-density relationship applies. What would you estimate the space-mean speed (mph) of these 2500 vehicles be? choices: 50.34, 48.61, 49.87, 51.46arrow_forwardSpot speed study has been carried out on a highway and collected data is shown in the table below. Speed range (kmph) No. of vehicles observed 0-10 10 10-20 13 20-30 15 30-40 12 40-50 16 Determine the design speed for checking the geometric design of the highway.arrow_forward
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