The municipality that controls that arterial road reduced the posted speed limit, hoping to reduce the average speed of the road to 60 km/h. After introducing the new speed limit, the municipality collected a new speed sample (sample size = 220) to calculate the operating speed. The average speed and the standard deviation of the new sample were found to be 61.09 km/h and 8.95 km/h, respectively. Based on this information, answer the following question a) Is the speed reduction (if there is any) statistically significant? b) Was the target speed achieved by introducing the new speed limit?

The municipality that controls that arterial road reduced the posted speed limit, hoping to reduce the average speed of the road to 60 km/h. After introducing the new speed limit, the municipality collected a new speed sample (sample size = 220) to calculate the operating speed. The average speed and the standard deviation of the new sample were found to be 61.09 km/h and 8.95 km/h, respectively. Based on this information, answer the following question a) Is the speed reduction (if there is any) statistically significant? b) Was the target speed achieved by introducing the new speed limit?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: Select the true items related to critical gap. Select only the four correct answers. It is a…

A: Critical gap : A critical gap is a minimum time gap that required to enter in a circulating…

Q: If the model In us = In uf-k/kj is applicable to depict the correlation between speed (mi/h) and…

Q: At an impaired driver checkpoint, the time required to conduct the impairment test varies…

Q: The arrival of vehicles at a specified roadway location is Poisson distributed. The flow count shows…

A: Given, q = 540 veh/hr

Q: 1. Two sets of students are collecting traffic data at two sections, xx and yy, of a highway 1400 ft…

A: Note : Since you have posted a question with multiple sub-parts, we will solve the first three…

Q: A researcher was observing traffic along one lane of a rural highway. During a 1 minute time…

Q: Given a freeway flow study at a certain highway. The speed- density relationship is described in the…

A: aVs=60-0.48kat Freeflow speed k=0VFF=60kmphAt jam density VS=00=60-0.48kJKJ=125 veh per km

Q: If the model in us = In uf-k/kj is applicable to depict the correlation between speed (mi/h) and…

Q: Two sets of students are collecting traffic data at two sections, xx and yy, of a highway 1,200 ft…

Q: Question 3: (a) A section of highway is known to have a free-flow speed of 95 km/h and a capacity of…

A: Given, Free flow speed (uf) = 95 kmph Capacity (qc) = 3300 vph Passing Time (t) = 1.6 sec/veh

Q: (b) An engineer wishing to determine whether there is a statistically significant difference between…

Q: 2.33 A test of a driver's perception/reaction time is being conducted on a special testing track…

A: The initial speed of the vehicle, vo= 50mi/hrThe distance between the vehicle and the object when…

Q: 9. The table below shows the data collected on a highway during a speed study. Develop the frequency…

Q: The average speed of vehicles on an expressway is being studied. a. Suppose observation on 50…

A: Given,n=50sample mean, x¯=65 km/hrstandard deviation, σ=6 km/hrto determine,the two-sided 99%…

Q: A researcher was observing traffic along one lane of a rural highway. During a 1 minute time…

Q: A car is stopped at an entrance ramp to a freeway; its driver is preparing to merge. At a certain…

Q: A before-and-after speed study was conducted to determine the effectiveness of a series of rumble…

A: To determine whether the rumble strips were effective, we need to compare the average speed before…

Q: 4) A spot speed study conducted on Sacramento State campus reported an average speed of 28.51 mph…

A: Given: Average Speed=28.51 mph Speed limit = 25 mph Standard deviation =5.75 mph

Q: 1. Assume you are observing traffic in a single lane of a highway at a specific location. You…

Q: Vehicle time headways and spacings were measured at a point along a highway, from a single-lane…

A: Given:- The average values of the vehicle time headways = 2.5 sec/veh The spacing = 200 ft/veh To…

Q: The data shown below were obtained by time-lapse photography on a highway. Use regression analysis…

Q: A researcher was observing traffic along one lane of a rural highway. During a 1 minute time…

A: Give data:-The given time interval is, 1 minutewe observed the number of vehicles, 10 vehicles

Question

The municipality that controls that arterial road reduced the posted speed limit, hoping to reduce
the average speed of the road to 60 km/h. After introducing the new speed limit, the municipality
collected a new speed sample (sample size = 220) to calculate the operating speed. The average
speed and the standard deviation of the new sample were found to be 61.09 km/h and 8.95 km/h,
respectively. Based on this information, answer the following question
a) Is the speed reduction (if there is any) statistically significant?
b) Was the target speed achieved by introducing the new speed limit?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

I posted this question yesterday, but the solution feels wrong. In the solution, K and Kj were taken as the same value, is it correct? Apologies for resubmitting, there used to be a follow-back question option, but I can't see it.
Question 2 If the model In us= ln uf - k/kj is applicable to depict the correlation between speed (mi/h) and density (veh/mi) on a highway segment, and employing regression analysis provides the model constants Y = A + BX (where Y = In u, X = k) as A = 3.9 and B = -0.018, then calculate the: Jam density in veh/km. Express answer into two decimal places. Do not type the unit. veh/km.
A researcher was observing traffic along one lane of a rural highway. During a 1 minute time interval, ten vehicles were observed travelling 65, 64, 71, 66, 58, 72, 69, 66, 55 and 62 mph. Using these spot speeds, calculate the time mean speed (mph). Provide your answer to the nearest tenth of a mph.
The data shown below were obtained by time-lapse photography on a highway. Use regression analysis to fit these data to the Greenshields model and determine the following. Speed (mi/h) Density (veh/mi) 84 16.2 24.7 69 33.3 54 39.7 40 52.0 19 55.1 14 (a) the mean free speed (in mi/h) mi/h (b) the jam density (in veh/mi) veh/mi (c) the capacity (in veh/h) veh/h (d) the speed at maximum flow (in mi/h) mi/h
From data collected on a metropolitan arterial road, it has been found that speed (v in kph) and density (k in vpk) are related by the following expression: v=72 0.72k Plot the speed-density diagram. Write the equation of the plot on this diagram and show the values of free-flow speed, critical speed, critical density and jam density on this diagram. Plot the flow-density diagram. Write the equation of the plot on this diagram and show the values of free-flow speed, critical speed, critical density, jam density and capacity on this diagram. Plot the speed-flow diagram. Write the equation of the plot on this diagram and show the values of free-flow speed, critical speed and capacity on this diagram.
A sample of 100 over-all travel speed was observed on a four-lane, undivided Arterial Street. The sample mean was 35.45 mph, and the standard deviation of the sample was 5.20 mph. Assume that the sample of travel speeds was taken from a normal population. a) Find the percentage of vehicles in the population traveling between 33 and 44 mph. b) Between what limits may the mean of the population be expected to fall for a 95 percent level of confidence?
Civil engineering 2 Practice questions.
Q4 / The data from moving observer methods as shown in the table. Column 1 gives the sample number, column 2 gives the number of vehicles moving against the stream, column 3 gives the number of vehicles that had overtaken the test vehicle, and last column gives the number of vehicles overtaken by the test vehicle. Find the flowrate, density and mean speed. Also, plot the fundamental diagrams of traffic flow. 2 3 4 No. Sample 1 107 10 74 113 25 41 3 30 15 4 79 18 9.
Vehicles arriving at an intersection from one of the approach roads follow the Poisson distribution. The mean rate of arrival is 900 vehicles per hour. If a gap is defined as the time difference between two successive vehicle arrivals (with vehicles assumed to be points), the probability (up to four decimal places) that the gap is greater than 8 seconds is
A test of a driver’s perception/reaction time is being conducted on a special testing track with level, wet pavement and a driving speed of 50 mi/h. When the driver is sober, a stop can be made just in time to avoid hitting an object that is first visible 385 ft ahead. After a few drinks under exactly the same conditions, the driver fails to stop in time and strikes the object at a speed of 30 mi/h. Determine the driver’s perception/reaction time before and after drinking. [Assume Practical Stopping Distance].
A researcher was observing traffic along one lane of a rural highway. During a 1 minute time interval, ten vehicles were observed travelling 65, 64, 71, 66, 58, 72, 69, 66, 55 and 62 mph. Estimate the average vehicle spacing (ft/veh). Provide your answer to the nearest integer.
4. The statistical data of an urban spot speed study is given below. A set of 130 observations of spot speeds made by timing vehicles through a "Trap" of 88ft. The stopwatch was used to obtain data. The stopwatch data are grouped into 0.2 sec. Classes. The first column of the table shows the midpoint of each group. The second column of the table shows the frequency of the observations. Compute the following statistical values. a) The speed of each time class in mph (show it in the third column) b) The cumulative percent of vehicles traveling at or below indicated speed shown in the third column in mph (show it in the forth column) c) Mean or average speed (time-mean speed), median, mode, standard deviation, standard error of the mean, average time, space-mean speed, variance, 15%, and 85% speed. d) Plot the cumulative percentage, and show the statistical values of item (c) on the graph. e) Plot the frequency distribution curve and show the statistical values on the graph.