Problem 2. A car hits a tree at an estimated speed of 25 mph on a 3 % upgrade. If skid marks of 120 ft are observed on dry pavement (coefficient of braking friction, fb =0.35) followed by 250 ft (fb =0.25) on a grass stabilized shoulder, estimate the initial speed of the vehicle just before the pavement skid began.

Q: A car is traveling up a 1.5% grade at 65 mi/hr on good, wet pavement. The driver brakes to try to…

A: Given; Grade: 1.5% (or 0.015 as a decimal) Initial speed: 65 mi/hr Reaction time: 1.5 seconds…

Q: A truck travels along a straight, level road at the speed of 79ft/sec. when the driver is forced to…

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Q: A distracted driver is travelling at 65mph on a roadway with an upgrade of 4% before he finally…

A: Given, Initial speed, Vi = 65 mph or 95.33 ft/s Grade, G = 4% or 0.04 Rolling resistance factor, frl…

Q: an intersection with speed 45 mph. The road has a downhill grade of 1%. When the car is at a…

A: Using relation for stopping distance SSD=vt+v22gf±Gv=45mph=66ftsG=-1%=-0.01

Q: A driver is traveling 70 mi/hr on a road with a -2% downgrade. The driver's vehicle has a braking…

A: speed V = 70 mi/hr Grade G = -2% braking efficiency = 90% Stopping sight distance = 500 ft lateral…

Q: What is the SSD of a driver/vehicle traveling at 40 mph along a 5% uphill? Assume general braking…

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Q: A vehicle weighing 2000-lb is traveling 30 mph at 5% upgrade with rate of 6 ft/sec². The vehicle has…

A: solution: Given: vehicle weight = 2000 lb. speed = 30 mph grade = +5% acceleration rate = 6ft/sec2…

Q: 3. Drivers must slow from 70 mph to 40 mph to negotiate a severe curve on a rural highway. A warning…

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Q: The car's braking distance from a velocity of v= 96 km/hr is 45 m on a level pavement. Assuming that…

A:

Q: car is traveling downhill on a suburban road with a grade of 4% at a speed of 35 mph. Determine the…

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Q: 4. A car is traveling downhill on a suburban road with a grade of 4% at a speed of 35 mph. Determine…

A: stopping sight distance (SSD) One sort of sight distance utilized in road design is stopping sight…

Q: What is the braking distance (ft) when the design speed is 65 mph, assuming the AASHTO recommended…

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Q: highway has a design speed of 80 km/h and the friction coefficient of pavement is 0.3. Considering…

A: Given: Design Speed, V = 80 km/h Friction coefficient, f = 0.3 Reaction time, t = 2.5 s Average…

Q: An automobile’s braking distance from 108 km/h is 75 m on level pavement. Assume the braking force…

A:

Intersection Design

An intersection is a location where two or more roads or railways meet or join. The traffic movement is controlled at the intersection that depends on its design and type. It governs the operation, efficiency, speed, capacity, and safety of the highways, airways, and railways. The movement of the pedestrian causes hazards and delays at the intersection.