. Electric railway journal . URVEYS—FIG. 1—CHART SHOWING VARIATIONSOF TRAFFIC FROM DAY TO DAY THROUGHOUT THEWEEK ON A TYPICAL LINE the number of passengers wishing to ride on each carcannot be estimated beforehand with great precision, itis still possible to reach a fairly accurate knowledge ofthe diversity of loading on the cars passing a givenpoint in any fifteen-minute or thirty-minute period. The following figures illustrate the peculiarities oftraffic demand previously referred to: Fig. 1 shows how traffic on a typical line varied fromday to day throughout a week. It would be of interestt
. Electric railway journal . URVEYS—FIG. 1—CHART SHOWING VARIATIONSOF TRAFFIC FROM DAY TO DAY THROUGHOUT THEWEEK ON A TYPICAL LINE the number of passengers wishing to ride on each carcannot be estimated beforehand with great precision, itis still possible to reach a fairly accurate knowledge ofthe diversity of loading on the cars passing a givenpoint in any fifteen-minute or thirty-minute period. The following figures illustrate the peculiarities oftraffic demand previously referred to: Fig. 1 shows how traffic on a typical line varied fromday to day throughout a week. It would be of interestto speculate on the reasons for the fluctuations fromMonday to Friday and for the 15 per cent increase intraffic on Saturday. Does this figure represent condi-tions fairly well maintained throughout the year, orwere unusual conditions encountered at the time thesedata were taken? Does the Saturday increase repre-sent travel to parks, to ball games or to steam and in-terurban electric railway stations, or does it represent. Time of Year TRAFFIC SURVEYS—FIG. 2—CHART SHOWING FLUCTUA-TIONS FROM MONTH TO MONTH IN TRAFFIC ON ATYPICAL LINE (a) The seasonal and daily variation in the ridinghabit of the community. (b) The concentration of riding within certain hoursof the day, and (c) The variation in the number of passengers wish-ing to ride on consecutive cars operating at an undis-torted headway. The exceptionally heavy loading of the first car topass after an unusual delay is expressly eliminated fromconsideration, and there is in mind only the fact that evening rides to places of amusement? Does it offerany suggestions as to means of increasing traffic andparticularly traffic at times when the companys equip-ment is not in use? These and many other ques-tions it is within the province of the traffic survey de-partment to answer. Fig. 2 represents fluctuations of traffic from monthto month and will suggest inquiries of value to any com-pany. Is the seasonal variation in ridin
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