A car is traveling downhill on a suburban road with a grade of 3% at a...

 

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A car is traveling downhill on a suburban road with a grade of 3% at a speed of 45 mi/h. Determine the required stopping sight distance, assume a=10 ft/sec. (pereeption reaction time =2.5 sec.) 7 :Second Question The following data represent a set of speed data collected on a rural road, complete the table and determine; Grade 1- The arithmetic mean speed. 2- The standard deviation. 3- The 85" percentile speed. n (u, - u)' Cumulative % of 1, x u, Frequency, Mid class Speed class, value, u, of % observation km/h observations 2 35 34-35.9 6 37 36-37.9 15 38-39.9 10 40-41.9 8 42-43.9 44-45.9 3. 46-47.9 total A car is traveling downhill on a suburban road with a grade of 3% at a speed of 45 mi/h. Determine the required stopping sight distance, assume a=10 ft/sec. (pereeption reaction time =2.5 sec.) 7 :Second Question The following data represent a set of speed data collected on a rural road, complete the table and determine; Grade 1- The arithmetic mean speed. 2- The standard deviation. 3- The 85" percentile speed. n (u, - u)' Cumulative % of 1, x u, Frequency, Mid class Speed class, value, u, of % observation km/h observations 2 35 34-35.9 6 37 36-37.9 15 38-39.9 10 40-41.9 8 42-43.9 44-45.9 3. 46-47.9 total

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