Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 4, Problem 4P
To determine
Whether the engineer has met with all of the requirements of the study
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An engineer wishing to obtain the speed characteristics on a bypass around her city at
a confidence level of 95%, and an acceptable limit of 1.0 mi/h collected a total of
130 spot speed samples and determined that the variance is 25 (mi/h)2
. Has the engineer met with all of the requirements of the study?
An engineer wishing to obtain the speed characteristics on a bypass around her city at a confidence level of 95%, and an acceptable limit of 2.0 km/h collected a total of 104 spot speed samples and determined that the variance is 4.8 km/h. Has the engineer met with all of the requirements of the study?
1.What is the variance in this question; 'the lambda'?
2.What is acceptable error in this question
3.What is the minimum number of observations to meet the requirements of the study
4.
Has the engineer met with the requirements of the study?
File a YES or NO response
An engineer wishing to obtain the speed characteristics on a bypass around her city at
a confidence level of 95%, and an acceptable limit of + 1.0 mi/h collected a total of
130 spot speed samples and determined that the variance is 25 (mi/h). Has the engi-
neer met with all of the requirements of the study?
Chapter 4 Solutions
Traffic and Highway Engineering
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- 4-4 An engineer wishing to obtain the speed characteristics on a bypass around her city at a confidence level of 95%, and an acceptable limit of ± 1.0 mi/h collected a total of 130 spot speed samples and determined that the variance is 25 (mi/h)². Has the engi- neer met with all of the requirements of the study?arrow_forwardQuestion 4 One stretch of two-lane two-way roadway that traverses through level terrain is expected to carry 1400 vehicle per hour. Determine the Level of Service (LOS) in the peak direction for the road based on average travel speed (ATS) if the characteristics of the roadway are as follows: Table Q4-1 Percentage of Trucks Percentage of Recreational Vehicle Peak Hour Factor 10 0.97 60:40 60 Percent Directional Split Percent no-passing Zone Lane Widths Shoulder Widths Design Speed Road Length Access Points 3.35 m 1.2 m 96 km/h 8 km 10 access points per km State all assumption (if any) used in calculation..arrow_forwardThe following travel times were observed for 4 vehicles traveling a one km segment of the SLEX. It is required to determine the space mean speed of these vehiclesarrow_forward
- A driver traveling down a 4% grade collides with a roadside object in rainy conditions, and is issued a ticket for driving too fast for conditions. The posted speed limit is 65 mi/h. The accident investigation team determined the following: The vehicle was traveling 40 mi/h when it struck the object, braking skid marks started 205 ft before the struck object, the pavement is in good condition, and the braking efficiency of the vehicle was 93%. Using theoretical stopping distance, assuming aerodynamic resistance is negligible, and with the coefficient rolling resistance approximated as 0.015, should the driver appeal the ticket? Why or why not?arrow_forwardThe following data was collected at the minor leg of a two-way stop controlled unsignalized intersection. Given this data, what is the field-measured critical gap, te, for this approach?arrow_forward5. Calculate the minimum passing sight distance required for a two-lane rural roadway that has a posted speed limit of 45 mi/h. The local traffic engineer conducted a speed study of the subject road and found the following: average speed of the passing vehicle was 47 mi/h with an average acceleration of 1.43 mi/h/sec, and the average speed of impeder vehicles was 40 mi/h.arrow_forward
- Question 1 Calculate the stopping sight distance on a highway at a descending gradient of 3% for a design speed of 100 kmph. Assume other data as per IRC recommendations. Question 2 Calculate the safe stopping distance while travelling at a speed of 80 kmph on an upward gradient of 2 percent. Make suitable assumptions.arrow_forwardA highway has a posted speed limit of 50mph and, on one section, has both horizontal and vertical curves, as shown in the following Figure. A recent daytime crash (driver traveling and striking a stationary roadway object) resulted in a fatality and a lawsuit alleging that the speed limit is an unsafe speed for the curves. 1) Evaluate if the roadway design (horizontal and vertical curves) is reasonable as compared to the minimum curve length requirement due to sight distance. 2) Based on the above calculations, comment if the roadway design is the cause of this crash. Plane view PC=16+00 Profile view G1=-2% 24ft Sight obstruction 80⁰ PVC = 14+00 e= 8% PT=32+75 G2= + 4% PVT=18+80 Narrow_forwardData obtained from aerial photography showed six vehicles on a 600 ft – long section of road. Traffic data collected at the same time indicated an average time headway of 4 sec. Determine (a) the density on the highway, (b) the flow on the road, and (c) the space mean speed.arrow_forward
- b- It was required to estimate AADT for a rural highway (16) hours data were collected for Friday ,Saturday and Wednesday during June the traffic volume were as follow Friday (7000) vehs. Saturday (8000) vehs. Wednesday (10000) vehs. The percentage of June traffic (116%) of the average then find future directional design hourly volume let (16 hours = 93% of a day traffic, k=0.12,D=0.55, r=0.06, x=2, n=20)arrow_forwardCalculate the minimum passing sight distance required for a two-lane rural roadway that has a posted speed limit of 45 mi/h. The local traffic engineer conducted a speed study of the subject road and found the following: average speed of the passing vehicle was 47 mi/h with an average acceleration of 1.43 m/h/sec, and the average speed impeder vehicles was 40 mi/h.arrow_forwardA horizontal curve of 250 m on a road section is operated under the posted speed of 80 km /hr . The field study shows that there is no enough ROW to realigned the curve for any instances if the new posted speed will be equal to the design speed , knowing that the posted speed is the 85 ^ (th) percentile of design speed . Is it possible that the vehicle can operate at the new posted speed ?arrow_forward
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