What is the SSD of a driver/vehicle traveling at 40 mph along a 5% uphill? Assume general braking Select one: O a. 282 ft. O b. 163 ft. O c. 505 ft. O d. 326 ft.
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how do you find SSD? how is SSD 1.47?how do you determine breaking conditions? How is it 2.5?
- A vehicle moving in wet weather along down grade highway of (- 4%) grade. The design speed (48mile/hr.), (f = 0.30), (t = 2.50 Sec.). The stopping sight distance you recommended is equal to: 471.784 ft. 480.424 ft. O 401.424 m/sec. O 345.434 ft. O 417.424 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/secA driver (with a reaction time 0.60 sec) is driving down hill on a 5% grade at 60 km /hr .find minimum stopping sight distance required on highway section ?assume coefficient of friction =0.7 locked wheels?
- Q2/ A track traveling at 25mph is approaching a stop sign. At time to and a distance of 60 ft the track begins to slow down by decelerating at 14 ft/sec? .do you think the track be able to stop in time.Plz, solve this problem. Transportation Engineering-2 A four-lane highway (2 lanes in each direction) with 3.65m lanes has a horizontal curve designed for a 380 m centerline radius, and a 110 km/hr design speed. The grade is level. Use a driver perception reaction time of 2.5 sec and a vehicle deceleration rate of 3.4 m/sec2. Determine the closest distance any roadside object may be placed to the centerline of the inside lane of the roadway.(note: Do not round any value. Use calculated values).A driver of a car applied the brakes and barely avoided hitting an obstacle on the roadway. The vehicle left skid marks of 26 m. (Assume f-0.6) determine whether the driver was in violation of the 70 km/hr speed limit at the location if he was travelling : a/ uphill on a 3° incline or, b/ downhill on a 3º incline.
- 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.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 stopping sight distance of 180m is available for placement of a warning sign of an impendinghazard ahead on a road designed for 100km/hr The road is situated outside a rural town in theWestern Cape and is surfaced with asphalt at a longitudinal slope of -2.5% toward the hazard.Accidents are being regularly reported on this section of road in the winter months. If a brakeand perception time of 1.7 seconds is assumed, use the table below and evaluate the SSDcondition. Motivate all the assumptions made in your calculations.
- 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.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.12. The stopping sight distance of a vehicle is 295 meters. Given that the acceleration of the vehicle is 3.45 m/s2 and travelling at a maximum grade of -3.5%, determine the following: a. Velocity of the vehicle in miles per hour. ; b. Reaction distance in yards.