Q3: A four-leg intersection with no traffic control is formed by two-lane roadswith the speed limits on the minor and major roads being 15 and 25 mi/h,respectively. If the roads cross at 90° and a building is to be located at a distanceof 45 ft from the centerline of the outside lane of the major road, determine theminimum distance at which the building should be located from the centerline ofthe nearest lane on the minor road so that adequate sight distances are provided.

Given:- Four-leg intersection speed limit on minor road=15 mi/h speed limit on major road=25 mi/hr…

Answered: Q3: A four-leg intersection with no…

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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A 5˚ curve (measured at the centerline of the inside lane) is being designed for a highway with a design speed of 65 mi/h. The curve is on a 2% upgrade, and driver reaction time may be taken as 2.5 seconds. What is the closest any roadside object may be placed to the centerline of the inside lane of the roadway while maintaining adequate stopping sight distance?
For the Greenshields model, the mean free flow speed on a highway facility lane equals 75 mph near zero density, and the jam density is observed to be about 160 veh/mi. Plot the q-k-u curves in proper order. Write down the speed-density, flow-speed, and flow-density equations. Find out the maximum flow, and also mark it on your diagrams. Compute speeds and densities corresponding to a flow of 2,880 veh/h, describing traffic conditions from a driver’s point of view. Calculate average headways, gaps, clearance, and spacing at CASE 1: maximum flow and at CASE 2: jam density. (Suppose the average vehicle length is 17ft)
A car is traveling up a 1.25% grade of a crest curve with a design speed of 65 mph. The descending grade is -2.75%. What is the required length of curve for minimum proper stopping sight distance? AASHTO Minimum Stopping Sight Distances on Level Roadways (based on braking distance) stopping sight distance design speed (mph) braking distance on level (ft) design (ft) (m) brake reaction distance calculated (km/h) (ft) (m) (m) (ft) (m) (20) (30) (40) (50) (60) (70) (80) (90) (100) (110) (120) (130) (13.9) (20.9) (27.8) (34.8) (41.7) (48.7) (55.6) (62.6) (69.5) (76.5) (83.4) (90.4) (4.6) (10.3) (18.4) (28.7) (41.3) (56.2) (73.4) (92.9) (114.7) (138.8) (165.2) (193.8) (18.5) (31.2) (46.2) (63.5) (83.0) (104.9) (129.0) (155.5) (184.2) (215.3) (248.6) (284.2) (20) (35) (50) (65) (85) (105) (130) (160) (185) (220) (250) (285) 15 55.1 21.6 76.7 80 20 73.5 38.4 111.9 115 25 91.9 60.0 151.9 155 30 110.3 86.4 196.7 200 35 128.6 117.6 246.2 250 40 147.0 153.6 300.6 305 359.8 423.8 45 165.4 194.4…
A traffic stream is moving at a steady state when entering a mountain grade. Upon entering the grade, the speed, density and flow are 72 km/h, 25 veh/km and 1800 veh/hr respectively. On the grade, a truck drops to a speed of 15 km/h causing traffic to bunch up to a density of 85 veh/km. When the truck pulls over, traffic accelerates to the maximum flow 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
A major roadway with a speed limit of 35 mi/h has an intersection that has no intersection control with a minor roadway at a right angle. A building is located next to the intersection at a distance of 50 ft from the center of the near lane on the major roadway and 40 ft from the center of the near lane on the minor roadway. At what speed for the minor roadway is the intersection safe? Grades are approximately level.
Design speed of a six-lane undivided highway is 70 mph. A circular section of the highway has level grade, 10-ft wide lane, and the radius of the highway centerline is 1000 ft. Calculate the minimum side clearance required from the edge of the innermost lane on the highway to provide adequate sight distance for safe travel
A 4-lane divided highway has a highway grade of -1.5%. The minor road approach grade is 3.5%. The design speed is 45 mph for the major road and 40 mph for the minor road. Find the left turn departure sight distance for a passenger car turning left from the minor road to the major road, The answer should be in feet.

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