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Seasonality of Transportation Data

Figure 6

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The monthly journey to work departure time data is shown in Figure 6a. The data varies from month to month and the values from year to year cross each other frequently.

FIGURE 6a - Three Year Averages and Three Year Aggregated Monthly Journey to Work Departure Time

The three year aggregate line reveals earlier departure times in May, August, and November and later departure times in January, March, and September. This is confirmed in Figure 6b which shows monthly variation from the mean of the journey to work departure times and how six months stay within a minute of the overall average (leaving about 7:18 in the morning) and the average departure time in the other months varies by about two, three or four minutes in either direction.

FIGURE 6b - Monthly Variation from the Mean of Journey to Work Departure Time

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Updated: 4/28/2011
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