"This report provides estimates of the relative risk among school travel modes using available information collected at the national level. Because data on trip purpose are not included in the available datasets for all modes, the data analyzed represent deaths and injuries that occurred during normal school travel hours as defined earlier. This approach to estimating exposure to risk is obviously different than an analysis based on trips taken specifically to and from school; because of the varied schedules and many activities of today's school children, however, the generic trip to and from school is difficult to define even with complete data. Regardless, as illustrated below, the substantial differences in risk across modes that are illuminated with these risk estimates cannot easily be explained away by any biases that might result from using this time-based estimating procedure."
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