Each transportation mode tends to define injury differently. In addition, each mode may generate its injury data using different methods. Therefore, comparisons across modes should be viewed very carefully. For further information on modal injury definitions, see the glossary section of this report.
In the following pages, another source of highway injury data—the National Electronic Injury Surveillance System operated by the U.S. Consumer Product Safety Commission—results in yet another set of highway injury data that differs from modal data presented here.