2.1 Average Time-Headway and Space-Headway of a given roadway are measured at 29sec and 29m₂ respectively. Calculate the following and show all units; a) Flow; b) Density: c) Speed.
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- An undivided multilane highway segment has the following characteristics: • Six lanes (three lanes in each direction); Lane width of 11 ft; • Speed limit of 45 mph; Right shoulders is 4 ft wide; • There are approximately 25 access points over a 2-mile section of this roadway, in each direction. Calculate the FFS at this highway section and then determine the level of service (LOS) when the flow rate is 1100 pc/h/In. (Write the answer for the LOS in the box below).Q1/ Use the following speed data collected from 2-lanes freeway section of 0.5 km under free- flow conditions, determine: 1- density, 2-space headway, 3- time mean speed, 4- space mean speed, 5- standard deviation, 6-variance. Speed, kph Frequency 36-40 8 41-45 10 46-50 51-55 56-60 61-65 14 22 17 11 66-70 71-75 12 4 76-80 2A section of highway has a speed-flow relationship of the form "q = au^2 + bu" It is known that at capacity (which is 3100 veh/hr) the space mean speed of traffic is 28mi/hr. Determine the speed when the flow is 1500veh/hr and the free flow speed. Please show all steps.
- A section of highway has a speed–flow relationship of the form q = au2 + bu, where q is the traffic flow in veh/h, u is the space-mean speed of traffic in mi/h, and a and b are unknown parameters. It is known that at capacity (which is 3100 veh/h) the spacemean speed of traffic is 28 mi/h. Determine the speed when the flow is 1500 veh/h and the free-flow speed.A section of the roadway has the following flow-density relationship q=50k-0.4k^2 [q is in veh/h unit and k in vh/mile]. What is the flow, speed,and density at capacity? What is the density when highway is at one-third of its capacity.Select one: is used in the qualitative evaluation of the operating conditions of the road. a. Headway b.Service volume c.Level of Service d.Density Which one of the following is NOT listed among the ideal traffic conditions? Select one: a. Traffic stream is consisting of only passenger cars b.Level terrain c.Most of the drivers are familiar with the road d.Six lanes in each direction
- Choose the right answer a rural highway on a level terrain has the following traffic composition: 40 % Passenger cars 30 % trucks 20 % buses 10 % recreational vehicles Find the total volume expressed as pcu/hr. if the total volume is 6000 veh/hr. * a-7620 b-7630 c-76400-1 A section of highway having a length 60 m. The observed data are 6 vehicles cross over it in a period of 148 sec., for the following duration: 2.4, 2.8, 3.0, 2.1, 2.2. and 3.5 sec. Estimate the values of the flow rate, density, space-mean speed, time-mean speed, average gap, and average clearance. If the length of vehicles are 6, 5.4, 6.6, 4.8, 7.5, and 6 m respectively? 0-2 Traffic volume data has been collected for 10 min time intervals as shown below. Find the total hourly volume, flow rate and PHF. Time 7:30-7:40 7:40-7:50 7:50-8:00 8:00-8:10 8:10-8:20 8:20-8:30 Volume 250 280 300 200 150 130 0-3|| A vehicle takes 1.5 hr to travers a distance of 90 km between two cities. Calculate the journey speed and operational delay if you know that the running speed of this vehicle exceeds it journey speed by 10 km/hr ?During the peak hour, an urban freeway segment has a traffic flow of 6,000 veh/h, with 4,000 vehicles with one occupant and 2,000 vehicles with two occupants. The freeway has five lanes, four of which are unrestricted opening to all vehicles regardless of vehicle occupancy and one lane that is restricted for use by vehicles with two occupants. Link performance functions for the length of this freeway segment are tu = 30+ 0.5vu for the unrestricted lanes and tr = 20+2vr for the restricted lane, where t’s are in minutes and v’s are in 1,000 vehicles. Solve for the distribution of traffic among the lanes using the SO principle and compare the savings in person hours relative to a UE solution, assuming that the compliance is perfect and that no single-occupant vehicles use the restricted lanes.
- 1. The rate flow at a point in the highway is 1200 vehicles/hour. Find the space mean speed in mph if the density of traffic is 25 vehicles per mile 2. Assume you are observing traffic in a single lane of McArthur Highway at a specific location. You measure the average headway and average spacing of the vehicles as 3.2sec. and 50 m. respectively. Determine the traffic speed in kilometer/hourQuestion 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..Given the following data on a certain highway section: uf=90km/hr and qcap=3600veh/hr Calculate the density corresponds to the flow value q=900veh/hr