Characteristics of the Driver, Vehicle and Roadway 1. Find an article from an online source that cites recent research and discusses the impact of distractions from cell phones/texting/etc on the perception-reaction time of drivers. Briefly summarize the article (a few paragraphs) and explain the results and their significance to highway design and traffic safety. What suggestions do you have to address the issue of distracted driving? 2. Mannering, Problem 2.30 3. Mannering, Problem 2.31 4. Mannering, Problem 2.32 5. Mannering, Problem 2.33 6. Mannering, Problem 2.39 2.39 A child accidentally runs into the street in front of an approaching vehicle. The vehicle is traveling at 40 mi/h. Assuming the road is level, at what distance must the driver first see the child to stop just in time? a. 153.7 ft b. 300.3 ft c. 318.8 ft d. 146.7 ft 2.33 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.) 2.32 A driver is traveling at 52 mi/h on a wet road. An object is spotted on the road 415 ft ahead and the driver is able to come to a stop just before hitting the object. Assuming standard perception/reaction time and practical stopping distance, determine the grade of the road. 2.31 An engineering student claims that a country road can be safely negotiated at 65 mi/h in rainy weather. Because of the winding nature of the road, one stretch of level pavement has a sight distance of only 510 ft. Assuming practical stopping distance, comment on the student's claim.
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