Question 3: A) A driver is traveling at an average speed of 40 kph when a person is crossing the road. If the perception reaction time of the driver is 2 sec., and the acceleration rate (a) is 5 m/sece', knowing that f, (a/g) calculate: 1. The safe S.S.D. on a level road. 2. The safe S.S.D. on a 3% uphill road. 3. The safe S.S.D. on a 2% downhill road.
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- 1. In traveling a distance of 3km between points A and a car is driven at 100kph from A to B for t seconds and at 60kph from C to D also for t seconds. If brakes are applied for 4 seconds between B and C to give the car a uniform deceleration, calculate the t and the distance between A and B. 1/The driver of the vehicle on a level road determined that she could increase her speed from rest to 51 kph in 36.80 seconds and from rest to 66 kph in 96.80 seconds. If it can be assumed that the acceleration of the vehicle takes the form du/dt = - βut where u is the vehicle speed in m/sec. Determine the maximum acceleration of the vehicle.A car is traveling on a -4.20% grade for a design speed of 90 kph. Coefficient of friction between tires and pavement is 0.33. Driver's reaction time (including perception time) is 2.50 seconds. Determine the following: a.) acceleration of the vehicle in ft/s2 , b.) Stopping sight distance in meters. SHOW COMPLETE SOLUTION UPVOTE GUARANTEED asap.
- The field observations for the traffic characteristics of a road segment showed that the density = 60 veh/km and speed = 55 kph. What is the traffic speed at maximum flow rate if Dj = 130 veh/km. (Use Greenberg's model). а. none b. 71 O C. 55 o d. 86 O e. 683.) Two cars are traveling side by side on level terrain at 100 km/h on a road with a coefficient of adhesion of 0.8. The driver of car 1 has a 2.5-s perception/reaction time and the driver of car 2 has a 2.1-s perception/reaction time. The drivers are able to stop their respective cars in the same distance after seeing a roadway obstacle. If the braking efficiency of car 2 is 0.78, determine the braking efficiency of car 1. (Assume minimum theoretical stopping distance.) Note: mass factor=1.04, gravitational acceleration=9.807 m/s?If speed of the vehicle, v = 60 kmph, design friction coefficient 0.36 and driver reaction time is 2,5 second, then the stopping distance is: =
- An driver (t₁=1 sec) used brakes to avoid an accident when suddenly a person steps from behind parked car in the path of driver at distance 35m. can the drivers avoids the accident if he drive at velocity of: 45 km/hr, 55km/hr, 65 km/hr, 75 km/hr? (F= 0.45).A car is traveling at 76 mi/hr down a 3% grade on poor, wet pavement. The car's braking efficiency is 90%. The brakes were applied 320 ft before impacting an object. The car had an antilock braking system, but the system failed 200ft after the brakes had been applied (wheels locked). What speed was the car traveling at just before it impacted the object? (Assume theoretical stopping distance, ignore air resistance, and let Frl=0.015)What is the intersection sight distance (m) needed at a stop controlled intersection for a passenger car to turn left onto a 2-way, 4-lane road with a design speed of 80 km/h? Assume the vehicle turns into the closest lane. [round to the nearest meter] Response Feedback: ISD=0.278V t major g Remember, tg is increased by 0.5 seconds for the additional lane.
- 3. What should be the maximum speed (mph) of a car traveling on a leveled (zero grade) road surface if the available stopping sight distance is 400 ft? Assume 1.5 s of reaction time and braking friction coefficient of 0.35.The design speed of a multilane highway is 65 mi/h. Determine the following. Note: The term a g in the appropriate equation is typically rounded to 0.35 in calculations. Assume perception reaction time = 2.5 sec. (a) the minimum stopping sight distance (in ft) that should be provided for a level roadway Your response differs from the correct answer by more than 10%. Double check your calculations. ft (b) the minimum stopping sight distance (in ft) that should be provided for a roadway with a maximum grade of 3 percent. Your response differs from the correct answer by more than 10%. Double check your calculations. ftA student trying to test the braking ability of his car, determined that he needed 32 ft. More to stop his car downhill on a particular road than uphill when driving at 55 mph. Assuming that the coefficient of friction between the tires and the pavement is 0.30. Determine the braking distance downhill and the percent grade of the highway at that section of the road.