Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Question
Chapter 9, Problem 6P
To determine
The LOS in peak hour.
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17 An existing urban freeway with 4 lanes in each direction has the following characteristics:
Traffic data:
Peak hour volume (in the peak direction): 7070 veh/h
Trucks: 10% of peak hour volume
PHF _ 0.94
Geometric data:
Lane width: 11 ft
Shoulder width: 6 ft
Interchange spacing (average): 1.4 mile
Terrain: rolling
Determine the LOS in the peak hour. Clearly state assumptions used for any values not given. Show the demand flow rate, mean speed, and density for the given conditions.
4)
Determine the level of service (LOS) for a freeway segment with the following data.
Show all steps involved.
Demand volume (3452 vehicle per hour)
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Number of lanes (3 lanes in one direction)
Width of lanes (11ft per lane)
Lateral clearance on the right side of the freeway (4 ft)
Total ramp density (2 miles between ramps, or 0.5 ramps per mile)
Percent of heavy vehicles (5% trucks/buses and 0% recreational vehicles)
Peak hour factor (0.927)
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Terrain (level)
Driver population factor (familiar drivers)
Subject : Transportation engineering
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Chapter 9 Solutions
Traffic And Highway Engineering
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- Note: Don't copy from other experts solution. Please do it your own.. Make sure your calculations clearly.arrow_forwardAn urban freeway is to be designed using the following information. AADT = 52,500 veh/day K (proportion of AADT occurring during the peak hour): D (proportion of peak hour traffic traveling in the peak direction): Trucks: PHF = 0.94 Lane width: Shoulder width: Total ramp density: Terrain: 3 Determine the number of lanes in the peak direction required to provide LOS C. (Assume commuter traffic and assume no RVs.) lanes. 0.12 0.65 8% of peak hour volume demand flow rate 12 ft 10 ft 0.5 interchange/mile; all interchanges are to be cloverleaf interchanges rolling HV' Show all calculations required. (Calculate your answers for the peak direction only. Enter fy, the peak hour volume in veh/h, the free flow speed in mi/h, the demand flow rate in pc/h/In, the mean speed in mi/h, and the density in pc/mi/ln.) fHV peak hour volume 0.893 free flow speed mean speed density 6300 X Your response differs from the correct answer by more than 10%. Double check your calculations. veh/h 1500 X Your…arrow_forwardA 6-lane urban freeway is suggested to be designed with the following data: F.ADT = 45000 vpd, design hour factor= 0.12 and directional split = 65%. Rolling terrain, 10% trucks, 5% buses, 6% Rvs, PHF is 0.91 and all traffic are commuters. Then based on the HCM 2000 procedure, the equivalent passenger- car hourly flow rate is aboutarrow_forward
- (PLEASE USE FIGURE 14.5 TO ANSWER THE QUESTION) A consecutive upgrade consists of two sections, the first of 2 percent grade and 5000 ft long, and the second of 6 percent grade and 5000 ft long. Trucks comprise 10 percent of traffic. And recreational vehicles comprise 6 percent. Determine: the equivalent grade the PCEsarrow_forwardramps within 3 miles upstream and downstream of the segment midpoint. It is on rolling terrain with 10% heavy vehicles and is operating at capacity with a peak-hour factor of 0.9. If the road is expanded to four 11-foot lanes with a 2-foot right shoulder, and traffic after the expansion is projected to increase by 10% with the same heavy vehicle percentage and peak-hour factor, what is the new LOS and estimated density? P-22 Chapter 6 Problems hour. What would be the LOS before and after the heavy vehicles are allowed on the upgrade (assuming 50% SUTs and 50% TTs.)? 6.21 A multilane highway has four lanes (two lanes in each direction) and a measured FFS of 55 mi/h. The directional peak-hour volume is 1900 vehicles (the peak-hour factor is 0.80). One upgrade is 5% and is 0.62 mi long. Currently, heavy vehicles are not permitted on the highway, but local authorities are considering allowing heavy vehicles on this upgrade. If this is done, they estimate that 150 heavy vehicles will use…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_forward
- i need correct solution asap in 20 minsarrow_forwardNote: If you don't know the solution please leave it but don't copy from other websites solution. I need detailed correct solution.arrow_forwardA four-lane basic freeway segment on level terrain is being redesigned. The current roadway has 12 ft lanes with 4 ft shoulders. The proposed alignment would expand to six 11-ft lanes with 2 ft shoulders. The road carries 3000 vehicles in the peak hour in one direction, with 925 coming in the peak 15 minutes. The truck mix is 70/30 and makes up 10% of traffic. What is the density and LOS (level of service) before and after the proposed change?arrow_forward
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