1. 2001 National household travel survey user's guide, version 1;Bureau of Transportation Statistics,2003
2. Motor vehicle crash fatalities in the elderly: Rural versus urban;Clark;Journal of Trauma Injury, Infection, and Critical Care,2001
3. Age and fatality risk from similar severity impacts;Evans;Journal of Traffic Medicine,2001
4. Our nation's travel: 1995 NPTS early results report;Federal Highway Administration,1997
5. Highway statistics 2001;Federal Highway Administration,2002