A driver on a level two-lane highway observes a truck completely blocking the highway. The driver was able to stop her vehicle only 20 ft from the truck. If the driver was driving at 60 mi/h, how far was she from the truck when she first observed it?
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4. A driver on a level two-lane highway observes a truck completely blocking the highway. The driver was able to stop her vehicle only 20 ft from the truck. If the driver was driving at 60 mi/h, how far was she from the truck when she first observed it?
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- Traffic 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 diagramA two-lane minor road intersects a two-lane undivided major road at 90 degrees, forming a four-leg intersection with traffic on the minor road controlled by a yield sign. A building is located 50 m from the center line of the outside lane of the major road and 14 m from the center line of the nearest lane of the minor road. A passenger car on the minor road would like to cross the major road. Using the AASHTO procedure, determine the maximum speed that can be allowed on the minor road if the design speed on the major road is 80 km/h. Assume a 3% approach grade for the minor road. Note: 1km/hr = 0.62mi/h, 1ft = 0.3048m. An automobile traveling at a rate of 30 ft/sec is approaching an intersection. When the automobile is 120 ft from the intersection, a truck traveling at the rate of 40 fi/sec crosses the intersection, The automobile and the truck are on roads that are at right angles to each other. How fast are the automobile and the truck separating 2 sec after the truck leaves the intersection?
- 1. A freeway has three lanes in each direction and has a maximum flow of 100 veh/min. It is operating at 50 veh/min. A collision occurs, blocking the two lanes and restricting the flow of the third lane to 25 veh/min. The freeway has a constant speed of 60 veh/hr and its three- lane jam density is 60 veh/m. The incident is completely cleared in 30 minutes and traffic returns to normal as soon this happened. a. Determine the length of queue 20 mins after the collision. b. Determine the longest vehicle queue. 750 veh c. In how many minutes will the queue dissipate? 45 min. So vh.Shaban was driving on Miami highway a GMC trying to overtake Huda which was in the same direction with a truck. The speed of vehicles was 70 and 65 mi/h respectively. If the found to be 350 m, the minimum length of overtaking zonesProblem 3. Drivers must slow down from 60 mph to 40 mph to negotiate a severe curve on a rural highway. A warning sign is determined to be visible from 120 ft. away. How far must the sign be located, in advance of the curve, to ensure that vehicles have sufficient distance to decelerate? Use the standard reaction time and deceleration rate recommended by AASHTO for basic braking maneuvers.
- 1. A car is approachin an intersection with velocity 35 mph. When the car is at a distance of 200 ft from the intersection, the signal turned yellow. If the driver decides to break, will he be able to stop safely? The driver's reaction time is 1.5 s. Assume the road surface as leveled. The maximum braking effort is applied. Will your answer change, if the grade of the road surface is downhill 3%? A car is at a distance of 200 ft from an intersection stop line when the signal turned yellow. What should be the minimum speed of the car (miles/hour) if the driver decides to apply brake and is just able to stop at the line? Use reaction time of 1.5 s and the road surface has zero grade.A driver is traveling at 45 mi/h and has a perception-reaction time of 3 seconds. A deer is spotted at a distance of 380 ft ahead and the driver is able to come to a stop just before hitting the deer. Assuming practical stopping distance, what is the grade of the road in percent?Traffic on a freeway gives a Greenshield's flow relationship expressed as: Q = 65k-0.354k2 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 60 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 area 4. Traffic shockwave line as plotted and shown in the Q-k traffic model diagram
- A distracted driver is travelling at 65mph on a roadway with an upgrade of 4% before he finally notices a wreck up ahead that has a stopped the flow of traffic. The driverbegins braking at a distance of 270 feet before the site of the wreck the last 150 feet of roadway before the wreck is dry and poor condition, while the 120 feet of roadway before that is dry and in good condition. The vehicle has braking efficiency of 85%.Three vehicles ahead of the driver have been stopped by the wreck, each vehicle being 20 feet long and spaced at 10 feet. The first vehicle is also stopped at 10 feet before the site of the wreck. Will the driver be able to stop in time before hitting the nearest vehicle in front of him? (Assume theoretical stopping distance, ignore air resistance and let frl=0.015)Traffic on a freeway gives a Greenshield's flow relationship expressed as: Q = 65k-0.354k2 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 60 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 area 4. Traffic shockwave line as plotted and shown in the Q-k traffic model diagram Note: Show full solution. Do not copy in chegg it has different question Topic: Highway Engineering (Greenshield Model)3. Drivers must slow from 70 mph to 40 mph to negotiate a severe curve on a rural highway. A warning sign for the curve is visible for 100 ft. How far in advance of the curve is it necessary to post the sign to insure that vehicles are able to properly decelerate? Assume f-0.30, G=0.0% and perception reaction time is 2 sec.