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Seasonality of Transportation Data

Figure 5

In Figure 5a, we see the twelve travel time minute points for the "calendar" quarters. The first calendar quarter is January, February, and March; the second point is for the quarter including April, May, and June; the third quarter represents July, August, and September, and the fourth quarter is October, November and December. As can be expected with any aggregation, fewer points on the graph (quarters) reveal much less variation than the monthly aggregations in the previous graphs. Compared to the variation observed in the monthly graphs in Figure 3, Figure 5a is fairly flat.

FIGURE 5a - Weighted Calendar Quarters Minutes Traveled to Work

Figure 5b fluctuate and there is more variation among the values from the three years. "Seasonal" quarters consider December, January, and February as the "winter" quarter represented by the point over "January" in Figure 5b. Similarly, "spring" is represented by March, April, and May; "summer" by June, July, and August; and "fall" by September, October, and November.

FIGURE 5b - Weighted Seasonal Quarters Minutes Traveled to Work

Figure 5c provides the three-year calendar and seasonal quarter trends in the same figure.

FIGURE 5c - Average Calendar and Seasonal Quarter Journey to Work Travel Time

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