Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Question
Chapter 4, Problem 8P
To determine
The plot of expected noncompliance percentages versus the associated speed limit on a graph and recommend the speed for the road with reasons.
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To determine the ADT on the road, the data was collected as shown below on a Tuesday during the following. Consider If the traffic is expected to be 180% from the current traffic up to May 2030, Table 1: Traffic volume at specific time 7:00–8:00 a.m. 8:00 –9:00 a.m 9:00–10:00a.m 10:00–11:00 .m 11:00 –12 noon 150 120 130 50 20
The city received a complaint of afternoon
traffic speeding in a residential area. The
city suspected this was related to students
leaving a nearby school. The first action
taken by the city was to quantify the facts
by conducting a spot speed study. The city
decided to use the stopwatch method
because of their limited resources. The
Speed
(mph)
21.4
22.2
23
24
Frequency of
Vehicles
3.
25
26.1
27.2
28.9
30
31.5
33.3
35.2
37.5
9.
11
13
posted speed limit is 30 mph. The study
was conducted on a Wednesday and started
at 3:00 p.m. The time was selected to
correspond to the period when most
students leave the school. The study
continued until a sample size of 100
9
10
10
9.
40
42.8
vehicles was measured.
Spot 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.
Chapter 4 Solutions
Traffic and Highway Engineering - With Mindtap
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Similar questions
- 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.arrow_forwardThis is a three-part question. Data obtained from aerial photography showed eight vehicles on an 800 ft-long section of road. Traffic data collected at the same time indicated an average time headway of 3.7 sec. Part A. Determine the density on the highway in vehicles per mile. Part B. Determine the flow on the road in vehicles per hour. Part C. Determine the space mean speed in mph.arrow_forwardConsidering 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_forward
- It was determined through a survey that the rate of vehicles crossing a point on a highway is 400 veh/h. Calculate the probability of 5 vehicles arriving at an interval of 60 sec.arrow_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_forwardThe median speed of vehicles on a highway segment during rush hour is 40 mph with Cv of 0.2. Assuming lognormal distribution, find the fraction of time the speed will fall below 10 mph? What about greater than 50 mph?arrow_forward
- Q1 (a) i. 10,000 vehicle speed traffic data were collected during the weekday on route FT050 at Batu Pahat, Johor. Suggest how to quantify and describe the basic characteristic of this data. Then explain how the method you suggested can help others to understand the data. (4 marks) ii. Consider the following data from 11 truck speed data climbing a hilly road. Compute 5 (FIVE) basic statistics of the sample speed as following: Sample mean Median а. b. с. Variance d. Range Standard error of the mean е. Speed (km/h) 25 Truck 1 2 35 3 55 4 15 40 6. 25 7 55 8. 35 9. 45 10 11 20arrow_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_forwardConsidering linear relationship between density and speed, you are required to estimate the corresponding flow and speed values to densities of 20, 30, 40 60, and 70 veh/km. if the free flow speed is 110 km/hr and at the critical situation, is founded that are 110 vehicles on section of the road with length 2km, using the estimated values, draw a sketch showing the speed-flow-density relationships?arrow_forward
- 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.arrow_forward4) A spot speed study conducted on Sacramento State campus reported an average speed of 28.51 mph with 5.75 mph as standard deviation. Assuming that speeds have a normal distribution, what is the probability of speeding on Sacramento State campus (speed limit = 25 mph)?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_forward
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