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Seasonality of Transportation Data

Figure 12

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The journey to work departure times by mode for respondents that live and work in Springfield are shown in Figures 12a, 12b, 12c, and 12d. Compared to journey to work, there is even more variability in the monthly departure times. Even with weighting the values in the total average by the number of respondents in each mode, the total average is affected by outliers in the data. Of note, all solo drivers leave much later than the average in April. Carpoolers leave earlier than the average value in March. Bus transit riders leave before and after the mean departure time values as indicated in Figure 12c, but most bus departures are earlier. Figure 12d shows the three-year average lines for each mode. In general, solo drivers and carpoolers leave later in the morning for work compared to bus transit riders and the average departure times.

FIGURE 12a - Journey to Work Departure Time by Solo Drivers that Live and Work in Springfield, MA

The journey to work departure times by mode for respondents that live and work in Springfield are shown in Figures 12a, 12b, 12c, and 12d. Compared to journey to work, there is even more variability in the monthly departure times. Even with weighting the values in the total average by the number of respondents in each mode, the total average is affected by outliers in the data. Of note, all solo drivers leave much later than the average in April. Carpoolers leave earlier than the average value in March. Bus transit riders leave before and after the mean departure time values as indicated in Figure 12c, but most bus departures are earlier. Figure 12d shows the three-year average lines for each mode. In general, solo drivers and carpoolers leave later in the morning for work compared to bus transit riders and the average departure times.

FIGURE 12b - Journey to Work Departure Time by Carpoolers that Live and Work in Springfield, MA

The journey to work departure times by mode for respondents that live and work in Springfield are shown in Figures 12a, 12b, 12c, and 12d. Compared to journey to work, there is even more variability in the monthly departure times. Even with weighting the values in the total average by the number of respondents in each mode, the total average is affected by outliers in the data. Of note, all solo drivers leave much later than the average in April. Carpoolers leave earlier than the average value in March. Bus transit riders leave before and after the mean departure time values as indicated in Figure 12c, but most bus departures are earlier. Figure 12d shows the three-year average lines for each mode. In general, solo drivers and carpoolers leave later in the morning for work compared to bus transit riders and the average departure times.

FIGURE 12c - Journey to Work Departure Time by Bus Riders that Live and Work in Springfield, MA

The journey to work departure times by mode for respondents that live and work in Springfield are shown in Figures 12a, 12b, 12c, and 12d. Compared to journey to work, there is even more variability in the monthly departure times. Even with weighting the values in the total average by the number of respondents in each mode, the total average is affected by outliers in the data. Of note, all solo drivers leave much later than the average in April. Carpoolers leave earlier than the average value in March. Bus transit riders leave before and after the mean departure time values as indicated in Figure 12c, but most bus departures are earlier. Figure 12d shows the three-year average lines for each mode. In general, solo drivers and carpoolers leave later in the morning for work compared to bus transit riders and the average departure times.

FIGURE 12d - Average Journey to Work Departure Times by Three Mode Choice of People that Live and Work in Springfield, MA

Mode departure time by quarter is shown in Figure 13. Similar to the other sets of graphs, the scale on these three graphs is the same to allow for easy comparisons. Here, the seasonal quarterly lines are relatively flat. Aggregated Springfield workers leave at 7:20am each day using seasonal quarters (Figure 13b). The aggregated line in Figure 13a showing departure times for calendar quarters is not flat-in the first quarter, Springfield workers leave at approximately 7:28 p.m. in the first quarter and at 7:16 a.m. in the second quarter. Strikingly, bus transit riders leave later in the first quarter than the average and much earlier than the average in the second and third quarters. In contrast, carpoolers leave much later than average in the third quarter.

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Updated: 04/28/2011
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