A traffic engineer, wishing to determine a representative value of ADT on 250 highway links having similar volume characteristics, conducted a preliminary study from which the following estimates were made: mean volume= 45750 veh/day, standard deviation= 3750 veh/day. Determine the minimum number of stations for which the engineer should obtain 24-hour volume counts for a 95-t precision level. Use an allowable range error of 10%.

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Highway Safety

Proper highway safety refers to the methods or rules that prevent highway travelers from being killed or severely injured. Proper highway safety measures help to protect motorists, cyclists, pedestrians, passengers on public transport, and so on.