Examination of Crash Contributing Factors Brittany N Campbellbvolpe

Examination of Crash Contributing Factors Brittany N. Campbellb@volpe. dot. gov Volpe National Transportation Systems Center Research and Special Programs Administration U. S. Department of Transportation National Intelligent Vehicle Initiative Meeting Washington, D. C. June 25 -26, 2003

Presentation Outline Ø Ø Objective Target Crash Types and Subtypes Analysis of Crash Contributing Factors Concluding Remarks 2

Objective Obtain a better picture of crash contributing factors to: Ø Develop and prioritize countermeasure functions for crash warning systems Ø Estimate potential safety benefits 3

Light Vehicle Crash Distribution Based on 2000 General Estimates System Data 4

Target Crash Subtypes Rear-end Single Vehicle Off-roadway Lane Change Based on 2000 General Estimates System Data 5

Crash Analysis Ø Ø Crash Contributing Factors Severity Analysis Cross-correlation of Contributing Factors Primary Crash Contributing Factors 6

Crash Contributing Factor Analysis Towed vs. Not Towed (Rear-end) Based on 2000 General Estimates System Data 7

Crash Contributing Factor Analysis Towed vs. Not Towed (Single Vehicle Off-roadway) Based on 2000 General Estimates System Data 8

Crash Contributing Factor Analysis Towed vs. Not Towed (Lane Change) Based on 2000 General Estimates System Data 9

Distribution of Driver Inattention Rear-end Single Veh. Off-roadway Lane Change Look/Did Not See 4% 1% 11% Dist. By Other Occupant 1% 1% 0% Dist. /Moving Object 0% 0% 0% Talk Cell Phone 1% 0% 0% Adj. Climate Control 0% 0% 0% Adj. Radio/CD 1% 1% 0% Use Object Integral 0% 0% 0% Use Object Brought 2% 2% 0% Dist. By Outside 3% 0% 0% Eating/Drinking 1% 0% 0% Smoking Related 0% 0% 0% 48% 20% 35% Other Distraction 5% 10% 4% TOTAL 66% 35% 50% Dist. /Lost in Thought Based on 2000 data; LV towed due to damage. 10

Severity Analysis Contributing Factors Crash Type More Severe Crashes Less Severe Crashes Single Vehicle Alcohol/drugs Off-roadway Sleepy/drowsy Successful Evasive Maneuver Hit & Run Speeding (CF) Rear-end Alcohol/drugs Hit & Run Sleepy/drowsy Vehicle Defect (CF) Speeding (CF) Lane Change Sleepy/drowsy Hit & Run Speeding (CL) Speeding (CF) Based on 2000 General Estimates System Data 11

Cross-correlation Analysis Correlation of Inattention with Other Factors (Single Vehicle Off-roadway ~ Towed Due to Damage) 12

Priority Scheme 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Alcohol/drugs Driver incapacitation/impairment Ill/blackout Sleepy/drowsy Vehicle Defect (CL) Vehicle defects Vehicle Defect (CF) Inattention Driver’s Vision Obscured Speeding (CL) Speeding (CF) Successful Evasive Maneuver 11. Adverse Environmental Conditions 12. Hit & Run 13

Primary Contributing Factors Towed Due to Damage SVOR RE LC Alcohol/drugs 21% 8% 7% Ill/Blackout 2% 0% 0% Sleepy/drowsy 6% 1% 0% Vehicle Defect (CL) 3% 0% 1% Vehicle Defect (CF) 2% 2% 1% 14% 35% 26% 2% 2% 1% Speeding (CL) 27% 1% 8% Speeding (CF) 5% 8% 2% Successful Evasive Maneuver 0% 0% 0% Adverse Environmental Conditions 11% 16% 19% Hit and Run 0% 0% 1% Undetermined 7% 27% 34% 100% Inattention Driver’s Vision Obscured TOTAL: Based on 2000 General Estimates System Data 14

Concluding Remarks Ø Ø Dominant Contributing Factors Effect of Crash Severity on Contributing Factors Contribution of Multiple Factors to Crashes Dominant Primary Contributing Factors 15