What is the distance required to stop an average passenger car when brakes are applied on a 2% downgrade if that vehicle was originally traveling at 40 mi/h?
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- 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/secA car is traveling up a 3% grade, with the speed of 85mph, on a road that has good, wet pavement. A deer jumps out onto the road and the driver applies the brakes 290-ft from it. The driver hits the deer at a speed of 20mph.If the driver did not have antilock brakes, and the wheels were locked the entire distance, would a deer-impact speed of 20mph be possible? (Hint: check the braking efficiency) [Use Theoretical Stopping Distance]Problem 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.
- A car is approaching toward an intersection with speed 45 mph. The road has a downhill grade of 1%. When the car is at a distance of 250 ft from the intersection, the signal turned yellow. If the driver applies brake and the reaction time of the driver is 1.5 s, will the driver be able to come to a complete stop? Justify your answer with calculations. Assume braking friction coefficient of 0.35.What distance will a vehicle travel before coming to a complete stop from a speed of 70 mph, (a) When the vehicle is traveling on a level roadway with no grade, (b-1) When the vehicle is traveling uphill on a roadway of constant grade = 0.10, (b-2) If the roadway grade is not constant but starts at 0.10 uphill and decreases to 0 at a continuous rate, would the braking distance be equal to, greater than, or less than that in the case of a constant 0.10 uphill grade (briefly explain why) (c) When the vehicle is traveling downhill on a roadway of constant grade = 0.10. Assume a perception-reaction time of 2.5 seconds, and an a/g value equal to 0.35.1. 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 motorist travelling at 100 km/hr on a highway needs to take the next exit, which has a speed limit of 50 km/hr. The section of the roadway before the ramp entry has a downgrade of 3% and coefficient of friction (f) is 0.35. In order to enter the ramp at the maximum allowable speed limit, determine the braking distance (expressed in m) from the exit ramp.A driver is traveling at 90 mi/h down a 3% grade on good, wet pavement. An accident investigation team noted that braking skid marks started 410 ft before a parked car was hit at an estimated 45 mi/h. Ignoring air resistance, and using theoretical stopping distance, a. If the car’s antilock braking system was effective (no sliding wheels on the pavement), what would the crash speed be?What is the SSD of a driver/vehicle traveling at 40 mph along a 5% uphill? Assume general braking Select one: a. 282 ft. O b. 163 ft. O c. 505 ft. O d. 326 ft.
- A local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.A local street named Dysc Drive has a series of intersections controlled by four-way stop signs (because of sight distance problems, perhaps). The next intersection is controlled by a stop sign on Dysc Drive but no signs on the cross street (because it has the right-of-way). Discuss the safety aspects of this design, putting yourself in the place of a driver proceeding along Dysc Drive in this direction.QUESTION 2 An intersection has a speed limit of 35 mph and the intersection is 33 ft wide. Our "design vehicle" is 20 ft long and can brake at 11.2 ft/sec2. If PIEV time is 1.4 seconds, what is the value of minimum safe clearance time (in seconds)?