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MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305581159
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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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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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.
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.
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
Chapter 4 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
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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_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_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_forward
- Read the question carefully and give me right solution with clear steps.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_forwardplease help here are the choices please base your answer on the given choices thank youa. 3.33 b. 3.83 c. 4.33 d. 2.83arrow_forward
- please help us in this sample problem Note: please be accurate as possible since the answer on other website's asnwers on this questions are wrong thank you hope to have correct answerarrow_forwardEngineering /Civil Engineering /Transportation Engineeringarrow_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_forward
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