TRANSPORTATION ENGINEERING The city received a complaint of afternoontraffic speeding in a residential area. Thecity suspected this was related to studentsleaving a nearby school. The first actiontaken by the city was to quantify the factsby conducting a spot speed study. The citydecided to use the stopwatch methodSpeed(mph)21.422.223242526.127.228.93031533.335237.5Frequency ofVehicles39.because of their imited resources. The13posted speed Lmit is 30 mph. The studywas conducted on a Wednesday and started10was selected too the penod when moststudents leave the school The studysample size of 100at 3:00 p.m. The time109.10continued untilvehicles was measured.428

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The city received a complaint of afternoon traffic speeding in a residential area. The city suspected this was related to students leaving a nearby school. The first action taken by the city was to quantify the facts by conducting a spot speed study. The city decided to use the stopwatch method because of their imited resources. The Speed (mph) 21.4 22.2 Frequency of Vehlcles 3. 23 24 25 26.1 27.2 28.9 9. 13 posted speed imit is 30 mplh. The study was conducted on a Wednesday and started at 3:00 p.m. The time correspond to the penod when most students leave the school The study continued until vehicles was measured. 30 315 333 352 10 was selected to 10 9. 37.5 10 sample size of 100 428