A driver on a level two-lane highway observes a truck completely blocking the highway. The driver was able to stop her vehicle only 10 ft from the truck. If the driver was driving at 70 mi/h, how far was she from the truck when she first observed it (assume perception-rea

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 vehicle was moving with tractive force of 70 kN and then turned on curve having turning angle 60°. The percentage of tractive force lost due to turning will be

II. A student trying to test the braking ability of her car determined that she needed 19.5 ft more to stop her car when driving downhill on a road segment of 5% grade than when driving downhill at the same speed along another segment of 3.5% grade. Determine the speed at which the student conducted her test and the braking distance on the 5% grade if the student is traveling at the test speed in the uphill direction. - 30 points

Consider two cars approaching from the opposite directions at 90 km/h and 60 km/h. If the reaction time is 2.5 s, coefficient of friction is 0.7 and brake efficiency is 50% in both the cases, the minimum sight distance required to avoid a head-on collision will be nearly?

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].

Two cars,on a level surface, are approaching each other from the opposite directions at a speed of 120 kph and 90 kph respectively. The reaction time is 2.0 seconds. Compute the minimum sight distance required to avoid a head-on collision of the two cars. Use 2011 AASHTO formula.

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