MMUCC Model Minimum Uniform Crash Criteria

1. MMUCCModel Minimum Uniform Crash Criteria Crash Data Elements Scott R. Falb Traffic Records Forum July, 2003

2. Original MMUCC Crash Data Elements (1998) • Eighteen Collected Data Elements • Crash date & time, location, city and county, first harmful event information, light & weather conditions, reporting agency information, work zone and school bus related. • Eight Derived Data Elements • Crash severity, day of the week and number of: vehicles, motorists, non-motorists, fatalities & injuries.

3. 2nd Edition MMUCC Crash Data Elements (2003) • Nineteen Collected Data Elements • Crash date & time, location, city and county, first harmful event information, light & weather conditions, reporting agency information, type of intersection, relation to junction, work zone and school bus related. • Nine Derived Data Elements • Crash severity, day of the week alcohol/drug involvement and number of: vehicles, motorists, non-motorists, fatalities & injuries.

4. C1- Crash Case Identifier C2- Crash Date & Time C3- Crash County C4-Crash City/Place C5-Crash Location C6-First Harmful Event C7-Location of FHE C8-Manner of Collision No Change New Definition: 00:00 Start; time: 00:00-23:59 FIPS Code Reference FIPS Code Reference Lat/Long; LRS; Link Node New Def: Loc. Of FHE (First Harmful Event) Added new attributes; coordinated with MHE Added new attributes Clarified element: two vehicles Changes Made to 1st Ed. MMUCC Guideline in 2nd Edition

5. C9-Source of Information C10-Date/Time Reported to Law Enforcement C11-Weather Conditions C12-Light Conditions C13-Roadway Surface Cond. C14-Cont. Circum.-Environ. C15-Cont. Circum.-Road Added subfields for agency ID Focus Changed-When Agency was notified No Change Def. Changed: type/level o/light Added ice/frost, sand, oil Expanded entries: one to three Expanded entries: one to three Changes Made to 1st Ed. MMUCC Guideline in 2nd Edition

6. C16-Relation to Junction C17-Type of Intersection C18-School Bus Related C19-Work Zone Related New data element split from original “Type of Roadway Junction.” Added new attributes New Data element split from original “Type of Roadway Junction.” Interchange intersection added Expand Definition to include motor vehicles used as school bus No Change Changes Made to 1st Ed. MMUCC Guideline in 2nd Edition

7. CD1-Crash Severity CD2-Number of Motor Vehicles CD3-Number of Motorists CD4-Number of Non-motorists CD5-Number of Injured Persons CD6-Number of Fatalities CD7-Alcohol Involvement CD8-Drug Involvement CD9-Day of the Week New Attributes-Injury level New Name/New Definition Changed motorist to occupant Changed non-motorist to non-occupant Include Injury levels Changed Name Split into Alcohol Involvement Split into Drug Involvement No Change Changes Made to 1st Ed. MMUCC Guideline in 2nd Edition--Derived

8. Questions These Data Elements Attempt to Answer • Which Crash is this? • When and Where did the crash take place • What was the First Harmful Event? Where did it occur? • Who investigated? • What were the Contributing Circumstances? • At what type of Road Junction?

9. What use is the Right Data? • Identify & prioritize highway and traffic safety problem areas • Evaluate the effectiveness of laws and policies designed to save lives • Initiate new laws and policies designed to save lives and prevent injuries • Support the development and execution of safety countermeasures

10. What Use Is Common Data? • Many state’s data may provide too few cases alone • Multi-state data is often needed to evaluate different safety environments. • Multi-state data can point to regional or nation-wide problems • Multi-state data can be used to evaluate the effectiveness of different solutions