A traffic stream is moving at a steady state when entering a mountain grade. Upon enteringthe grade, the speed, density and flow are 72 km/h, 25 veh/km and 1800 veh/hrrespectively. On the grade, a truck drops to a speed of 15 km/h causing traffic to bunch upto a density of 85 veh/km. When the truck pulls over, traffic accelerates to the maximumflow until steady state flow conditions resume.Calculate (a) the flow of traffic behind the truck on the mountain grade(b) the jam density and free flow speed for this road(c) the density and speed when traffic resumes a steady state flow(d) the maximum flow

The flow of traffic behind the truck on the mountain grade is 1275 vehicles per hour.The jam density…

Answered: A traffic stream is moving at a steady…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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What is the SSD for a vehicle of design speed 60 kmph for a two-way traffic in single lane road? Use f= 0.37 and t = 2.5 sec
A section of highway has a speed-flow relationship of the form q = au2 + bu. It is known that at capacity (which is 3100 veh/h) the space-mean speed of traffic is 28 mi/h. Determine the speed when the flow is 1500 veh/h and the free-flow speed.
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Question 2. A segment of a two-lane high in Class 1 is on a rolling terrain and has an hourly volume of 1000 veh/h. This value is for both directions. The directional traffic split is taken as 60/40 and the peak hour factor is assumed to be 0.92. Asides the passenger cars, the traffic stream contains 6% large trucks, 3% buses and 6% recreational vehicles. (a) Determine the analysis direction flow rates for ATS and PTSF (2.5 marks) (b) Determine the opposing direction flow rates for ATS and PTSF (2.5 marks)
Andoks highway can accommodate speed of 80 kph under free-flowing conditions. On average, front bumper-to-bumper spacing of 1.58m is occuring on the highway such that the flow stops completely. Determine the flow of traffic on Andoks Highway if the average speed of the vehicles is 28 kph.
3.2 A roadway with only one lane in each direction carries traffic of 1200 veh/h at a point where there is a no passing solid line. The density is 20veh/h. A truck carrying a heavy load enters the traffic at 34km/h and this continues for a stretch of 5km before there is a passing lane and the truck can move over to the left hand lane. During this time the vehicle density increased to 80veh/km, decrasing the flow to 900veh/h. Calculate the length of the platoon and the number of vehicles involved.
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A freeway is to be designed for the following conditions:Heavy vehicle adjustment factor = 0.80Total ramp density =0.75 ramps/miTwo lanes each way with average lane width = 12 ftRight side lateral clearance = 4 ftNo. of lanes in one-way = 2 What is the free flow speed (FFS) in mph of the basic freeway segmen?

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