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Multivictim Motor Vehicle Crashes in San Diego County. Alan M. Smith, MPH; Edward M. Castillo, PhD, MPH; Barbara M. Stepanski, MPH; Leslie Upledger Ray, MA, MPPA County of San Diego Health and Human Services Agency, Division of Emergency Medical Services. Multivictim – Annex D.

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Multivictim motor vehicle crashes in san diego county

Multivictim Motor Vehicle Crashes in San Diego County

Alan M. Smith, MPH; Edward M. Castillo, PhD, MPH; Barbara M. Stepanski, MPH; Leslie Upledger Ray, MA, MPPA

County of San Diego Health and Human Services Agency, Division of Emergency Medical Services


Multivictim annex d
Multivictim – Annex D

  • Tour bus rollover in snow

  • 30 miles from nearest hospital

  • 39 casualties

  • 7 Hospitals

    • 5 trauma centers

  • 6 Ambulance Agencies

    • 11 units

  • 3 Law Enforcement Agencies

  • California OES


Background multivictim crashes
Background: Multivictim Crashes

  • 7% of crashes 5 or more victims

  • Large demand on resources

    • Emergency Medical

    • Hospital

    • Law Enforcement

    • Media coordination

  • Incident Command Structure

    • Triage, crowd control, hazard management

  • Communication

    • patient destinations


San diego county ems injury surveillance
San Diego County EMS Injury Surveillance

  • Integrated Injury Surveillance System

    • Prehospital

    • Trauma System

    • Medical Examiner

    • SWITRS

    • GIS


Methods data
Methods: Data

  • Statewide Integrated Traffic Records System (SWITRS)

    • Maintained by California Highway Patrol

    • Injury crashes for San Diego County

    • MVO crashes stratified by number of victims: 1, 2-4, 5-9, 10+

    • Fiscal year 2000/01


Methods analysis
Methods: Analysis

  • Number of victims in crash by:

    • Location

    • Time

      • Hour, Day of Week, Month

    • Violation category

    • Type of collision


Multivictim crashes
Multivictim Crashes

  • During FY 00/01, crashes with 5+ victims accounted for:

    • 7.3% of crashes

    • 21% of MVO victims

    • 15% of MVO injuries

    • 17% of MVO deaths


Death rate per 1 000 injuries by number of victims
Death Rate Per 1,000 Injuries by Number of Victims

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Number of parties involved
Number of Parties Involved

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Leading violation categories by number of victims in crash
Leading Violation Categories by Number of Victims in Crash

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Leading collision types by number of victims in crash
Leading Collision Types by Number of Victims in Crash

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Number of victims by road type
Number of Victims by Road Type

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Crashes by month and number of victims
Crashes by Month and Number of Victims

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Multivictim crashes by month
Multivictim Crashes by Month

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Crashes by day of week
Crashes by Day of Week

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Multivictim crashes by day of week
Multivictim Crashes by Day of Week

Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SWITRS database, FY 2000/01


Source: County of San Diego Health and Human Services Agency,

Division of Emergency Medical Services, SANDAG Population Estimates, 1999.




Results summary
Results - Summary Agency,

  • Multivictim MVO crashes made up

    • 7% of MVO crashes

    • 21% of victims

    • 17% of deaths

  • Violation categories:

    • Unsafe speed overall

    • Traffic signals/signs higher in multivictim

  • Collision types:

    • Rear end overall

    • Collision with object lower in multivictim


Results summary1
Results – Summary Agency,

  • Time

    • Peak in summer months, weekends

  • Parties

    • 58% involve one or two victims

  • Location

    • High population density (3+ parties)

    • Intercounty travel corridors (1-2 parties)


Conclusions
Conclusions Agency,

  • Multivictim crashes more often during non-work times (weekends, summer)

  • Multi-vehicle crashes in areas with high traffic volume

  • Single-vehicle crashes more likely on more open freeway corridors

  • Emphasize importance of passenger safety – no more passengers than seat belts


Conclusions cont
Conclusions (cont.) Agency,

  • BIG events uncommon

    • 1-2 per year with >=20 victims

  • Majority 1-2 parties

    • Emphasize seatbelt use

  • Majority not on freeways

  • Multiparty crashes in urban settings

    • Defensive driving


Limitations
Limitations Agency,

  • Only 1 year of data

  • Limited info on drivers

    • Residence

    • Destination

  • Not linked to ambulance data


Acknowledgements
Acknowledgements Agency,

  • The data collection efforts of the police and sheriff departments throughout the County are gratefully acknowledged, as is the cooperation of State staff for providing the SWITRS data to San Diego County.


Contact information
Contact Information Agency,

Alan M. Smith

County of San Diego

Health and Human Services Agency

Emergency Medical Services

6255 Mission Gorge Road

San Diego, CA 92120

(619) 285-6429 phone

(619) 285-6531 fax

[email protected]


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