Determine the operational service level of a basic highway segment with the characteristics presented below. Assume ideal conditions of lane width, slope, and clear side clearance. AADT = 108,920 vpd • 8 lane highway • Traffic composition: 6% trucks, 1% buses and 1% RVs Level ground PHF = 0.89
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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.Question 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..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) ● ● ● ● ● ● ● 1 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) I Terrain (level) Driver population factor (familiar drivers)
- Q: The expected daily traffic (AADT) for tow-way on a major six-lane flexible pavement highway consists of trucks of type 1 and 2 with equivalency factors as follow: type1 truck 1000/day(2. way) type2truck 500/day (2 way) 24kips(single) 24Kips(Tandem) 12kips(single) Equiv. 3.22 0.450 0.010 factor 24kips(single) 3.22 12 kips(Tandem) 0.026 Performance penod-15 years, annual growth rate=4%, tirectional distribution percent -70%, design lane percent 80 %, required structural number for subgrade = 5.7, asphalt concrete surfacing layer coefficient (4,-0.42), asphalt concrete base layer coefficient (a₂-034), gravel and soil subbase layer coefficient (93-0.12) and the modify drainage coefficient (m = 1.0) for all pavement courses Find the equivalent single axle load (ESAL) and draw a simple sketch of designed three pavement thickness courses with all necessary calculations?If Vf = 2327 VPH with 9% trucks, VR1 = 653 VPH with 5% trucks, and VR2 = 594 VPH with 8% trucks, what is the passenger car equivalents (Vpcph) of the onramp? Assume that the roadway is urban.Determination of Level of Service for Multilane Analysis Example • A segment of undivided four-lane highway on level terrain has: ● ● field-measured FFS 74.0km/h, lane width 3.4m, ● ● peak hour volume (PHV) 1900 veh/h, ● 13 percent trucks and buses, • 2 percent RVs, and ● ● 0.90 PHF. ● What is the peak-hour LOS, speed, and density for the level terrain portion of the highway?
- A new section of Richmond Highway is being designed as a six-lane facility (three in each direction) with a two-way left-turn lane. Determine the peak-hour LOS. (Assume commuter traffic, 5% trucks, and no RVs.) Traffic data: demand volume = 3,120 veh/h PHF = 0.95 assumed base free-flow speed = 55 mi/h Geometric data: urban setting rolling terrain lane width = 11 ft shoulder widths = 4 ft (right side) and 1 ft (left side) average access point spacing = 12 points per mile on each side LOS A LOS B LOS C LOS D LOS E LOS FPick up the correct statement from the following: (A) Seasonal cycle of traffic volume during April and November, is usually near the annual average (B) Mid-winter seasonal cycle of traffic is least (C) Mid-summer seasonal cycle of traffic is highest (D) All the above Selection of the routes, of highways depends upon (A) Feasibility of attaining ruling gradient (B) Avoidance of cutting hard rocks (C) Minimum number of bridges (D) All the above Answer: Option D Maximum number of vehicles that can pass a given point on a lane during one hour without creating unreasonable delay, is known as (A) Traffic density of lane (B) Basic capacity of lane (C) Probable capacity of lane (D) Practical capacity of laneDetermine the value of PTSF for a 6-mile two-lane highway in rolling terrain. Traffic data are as follows: • Volume = 1600 veh/h (two-way) • Percent trucks = 14% • Percent RVs = 4% • Peak hour factor = 0.95 • Percent directional split = 50 - 50 • Percent no-passing zones = 50
- Class Assignment – Traffic Theory Problem 1: The 25 year forecast AADT for a given highway section is 50000 vpd. If the route is classified as an urban radial route roadway, what mid-range of directional design hour volume (DDHV) would be expected?An 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…A proposed highway is to be designed with adequate shoulder and clearance in a level terrain with the following: AADT = 25,000 pcu/day D% = 65% K = 9%. Estimate the number of lanes that will provide LOS C.