Compute the total stopping sight distance (in feet) that a car moves during an emergency stop based on the following data: A. Initial velocity of car = 35 MPH B. Final velocity when it stops after 6 seconds = 0 KPH C. Slope of roadway = 2% (downhill) D. Perception-reaction time = 0.80 seconds

A driver with 20/20 vision traveling at 55 mph in the median lane desires to exit the freeway at the exit ramp. If 5-in. letters are used, what is the minimum distance the sign should be placed ahead of the ramp exit? (Some assumptions that would be helpful are perception-reaction time = 2 sec; exit speed = 30 mph; deceleration rate = 4.80 ft/s2 a driver with 20/20 vision can read a sign at 55 ft per inch of letter height.) Discuss your results.

A test of a driver’s perception/reaction time is being conducted on a special testing track with level, wet pavement and a driving speed of 50 mi/h. When the driver is sober, a stop can be made just in time to avoid hitting an object that is first visible 385 ft ahead. After a few drinks under exactly the same conditions, the driver fails to stop in time and strikes the object at a speed of 30 mi/h. Determine the driver’s perception/reaction time before and after drinking. [Assume Practical Stopping Distance].

During 5 successive 1.07 min intervals, a runner moves at the following constant speeds: 0,396 km/min, 0.248 km/min, 0.160 km, 0.160 km/min, and 0.320 km/ Compute the total distance traveled and the average speed.