One vehicle is following another on a 2 lane highway at night. According to the rule of right thumb, one car length of clearance per 10mph speed exists between cars. If both vehicles are traveling at 60mph and the lead car crashed into the rear of an unlighted parked truck, at what speed will the rear car hit the wreckage? (Assume a reaction time of 2.5 seconds, car length= 18ft and a coefficient of friction of 0.65. Is the rule of thumb safe? Under the prevailing conditions in this example what is the minimum space in terms of car length between cars for every 10mph speed to avoid the crash?
One vehicle is following another on a 2 lane highway at night. According to the rule of right thumb, one car length of clearance per 10mph speed exists between cars. If both vehicles are traveling at 60mph and the lead car crashed into the rear of an unlighted parked truck, at what speed will the rear car hit the wreckage? (Assume a reaction time of 2.5 seconds, car length= 18ft and a coefficient of friction of 0.65. Is the rule of thumb safe? Under the prevailing conditions in this example what is the minimum space in terms of car length between cars for every 10mph speed to avoid the crash?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:One vehicle is following another on a 2 lane highway at night.
According to the rule of right thumb, one car length of clearance
per 10mph speed exists between cars. If both vehicles are traveling
at 60mph and the lead car crashed into the rear of an unlighted
parked truck, at what speed will the rear car hit the wreckage?
(Assume a reaction time of 2.5 seconds, car length= 18ft and a
coefficient of friction of 0.65. Is the rule of thumb safe? Under the
prevailing conditions in this example what is the minimum space in
terms of car length between cars for every 10mph speed to avoid
the crash?
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