Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Question
Chapter 4, Problem 17P
To determine
(a)
The volume in southward and northward direction at the given section of the highway using moving-vehicle technique.
To determine
(b)
The travel time in southward and northward direction at the given section of the highway using moving-vehicle technique.
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Question 2
Because the new travel time rate (TTR) from the
additional traffic (e.g., 300vph) exceeds the minimum
acceptable local standard of 2.0 min/mile, it is
proposed to increase the road capacity by
900vph/lane by adding one lane in each direction.
Calculate the new travel time rate and traffic volume
using:
a. The traditional method of traffic impact analysis, and
b. The above-mentioned pivot point analysis method.
c. Compare the results of the two methods and comment on their
significance.
the following data were taken on five vehicles travelling consecutively 1.5km portion of the NLEX.
Vehicle Time(minute)
1
1.2
2
1.0
3
1.4
4
1.3
5
1.1
Determine the density of traffic in (Veh per km)
3.33
3.83
4.33
2.83
Chapter 4 Solutions
Traffic and Highway Engineering - With Mindtap
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- The table below shows data obtained in a travel time study on a section of highway using the moving-vehicle technique. Estimate (a) the travel time and (b) the volume in each direction at this section of the highway. Choices for northward: Tn = 5.9, 6.2, 5.2, 4.9 Vn = 535, 505, 514, 555 Choices for southward: Ts = 6.2, 5.2, 4.9, 5.9 Vs = 555, 535, 505, 517 Help me pls. I will upvote, Badly need your help. Thankyou :)arrow_forwardA flow characteristic that is related to the density and obtained from speed data is occupancy. Data obtained from a 6-ft by 6-ft inductive loop detector is used to determine the traffic density. With an occupancy of 9.375%, determine the density, in vehicles per mile, for a mean vehicle length of 27 feet.arrow_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
- 1. A study of freeway flow at a given site has yielded a relationship speed-density calibrated as follows: S = 57,5(1 - 0,008 D) For this relationship, specify: (a) free flow velocity, (b) congestion density, (c) velocity-flow relationship (d) flow density relationship, and (e) capacity. 2. Answer all the questions in Problem 1 for the calibrated density-velocity relationship the following: S = 61.2e^-0015Darrow_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_forward5. The table below gives data on accepted and rejected gaps of vehicles on the minor road of an unsignalized intersection. If the arrival of major road vehicles can be described by the Poisson distribution, and the peak hour volume is 1100 veh/h, determine the expected number of accepted gaps that will be available for minor road vehicles during the peak hour. Number of Rejected Gaps > t Number of Accepted Gaps >t Gap (t) (s) 1.5 92 3 2.5 52 18 3.5 30 35 4.5 10 62 5.5 2 100arrow_forward
- 2. Data 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. Ans. k = 52.8 veh/mi, q = 900 veh/h, SMS = 17.0 mi/harrow_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_forwardThe following figure shows the Level of Service (LOS) criteria for a multilane highway segment. If the free flow speed is 45 mph and the analysis flow rate is 1800 passenger cars per hour per lane (pc/h/In). What is the actual speed and density of the traffic flow at this specific location? What is the LOs of the location? 70 free-flow Seed 60 mih 56 mi 50 mih 45 mih LOS A 60 50 40 30 20 pomit 45 400 800 1200 1600 2000 2400 Flow Rate (pc/h/in) (uju) paads eg-buasseg abeanyarrow_forward
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