A child accidentally runs into the street in front of an approaching vehicle. The vehicle is traveling at 65 kph. Assuming the road is level and f = 0.35, at what distance must the driver first see the child to stop just in time? A) 45.1 m 97.2 m 47.5 m 92.6 m
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- A child accidentally runs into the street in front of an approaching vehicle. The vehicle is traveling at 65 kph. Assuming the road is level and f = 0.35, at what distance must the driver first see the child to stop just in time? A 47.5 m B 45.1 m 97.2 m D 92.6 mA driver travelling at 50mph sees a hazard (boulder) at a certain distance ahead. The driver then applies the brakes immediately (PIEV) time is 2 seconds and begins slowing the vehicle at 10m/sec? (decelerating). If the distance from the stopping point to avoid hitting the boulder is 10.28m, how far was the car from the boulder upon perception?Calculate the passing sight distance on a two lane road having the design speed of 86 kmph and reaction time 2 sec. Assume one way traffic. Take acceleration of overtaking and overtaken vehicle as 3 m/s2 and 1.5 m/s2 respectively. Assume that overtaken vehicle starts accelerating after the reaction time of overtaking vehicle. Take space headway as 18 m.
- The freeway speed for a 40 foot long vehicle that spends 1.5 seconds occupying a 6 foot radius, approximately circular loop is .... ...... 34.7 ft/sec 27ft /sec 22 ft/sec O 30 ft/secDevelop a signal timing for the intersection shown below. Assume values as necessary (provide justification on the assumptions). Level terrain Driver reaction time (t) = 1.0 s Vehicle deceleration rate (a) = 10 ft/s² Length of typical vehicle = 18 ft PHF = 0.90 375 %3D One way 1,200 Target v/c = 0.95 Low pedestrian activity 60 ft Average approach speeds: 35 mi/h WB 40 mi/h NB Crosswalk widths = 10 ft 2,105 Crosswalk setback = 2 ft ↑ Walking speed = 4.0 ft/s NB grade = 3% WB grade = -1% l1 = e = 2.0 s 300 One way N 55 ftThe driver of a car travelling at a certain speed suddenly sees an obstruction ahead and traveled a distance of 58.3m during the perception time of 1.3 sec. Determine the cars speed of approach in kph.
- A driver travelling at 50mph sees a hazard at a certain distance ahead. The driver then applies the brakes immediately, time is 2sec and begins slowing the vehicle at 10m/s^2. If the distance from the stopping point to avoid hitting the boulder is 10.28m, how far the car from the hazard upon perception.The following are specifications for traffic design of a highway:Speed of the passing car = 100 kphSpeed of the overtaken vehicle = 80 kphTime of initial maneuvers = 5 secTime passing vehicle occupies left lane = 10 secsDistance between the passing car and opposing car at the end of maneuver = 20 mAverage acceleration = 2.5 kph/sec. 1. Determine the required total passing sight distance for said road a. 502.75 m b. 602.75 m c. 702.75 m d. 402.75 m 1. Find the minimum required passing sight distance. a. 280.37 m b. 390.37 m c. 48.37 m d. 490.37 mTraffic on a freeway gives a Greenshield's traffic flow relationship expressed as: Q = 60k-0.16667k? At 10AM, an accident occurs 4 km downstream of an access ramp. The vehicles pull onto the shoulder of the roadway, but traffic passing the accident area slows to 10 kph as drivers survey the damage on the side of the road. A patrol car enters the freeway via access ramp, also at 10AM. Upon entering the freeway, the patrol car notes that traffic on the freeway is moving along at about 40 kph. Determine the following: 1. Capacity flow of the highway 2. Traffic shockwave created by the road accident 3. Time in AM the patrol car will reach the accident zone 4. Plotted traffic shockwave line in the Q-k traffic model diagram
- (TRAFFIC AND HIGHWAY ENGINEERING) A tall building is located 13.5 m from the centerline of the right lane of a local road and 19.5 m from the centerline of the right lane of an intersecting road in figure below. If the maximum speed limit on the intersecting road is 56 km/h, what should the speed limit on the local road be such that the minimum sight distance is provided to allow the drivers of approaching vehicles to avoid imminent collision by adjusting their speeds? Approach grades are 2 percent.Calculate the minimum length of overtaking zone of a one way traffic road if the velocity of the overtaking and the overtaken vehicles are 110 and 60 kph, and the acceleration of the vehicle is 1.2 m/s^2. (Hint: overtaking sight distance is just a third of minimum length of overtaking zone).Compute the intermediate sight distance for a freeway with a design speed of 80kph if the perception time is assumed to be 2.5 seconds with a skid resistance of 0.70. Assume brake efficiency to be 60%.