Summary of Changes to the Ist Edition--MMUCC, DOT HS 809 577, April 2003

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MMUCC
MODEL MINIMUM UNIFORM CRASH CRITERIA GUIDELINE
Improving Crash Data for Safer Highways

SUMMARY OF CHANGES TO THE
MMUCC GUIDELINE, 1ST EDITION (1998)

Only half of the original 113 MMUCC data elements needed to be revised or deleted. The remaining data elements required only minor editorial changes or were left as is. The MMUCC Guideline, 2nd Edition (2003) includes 111 data elements. Only five data elements (5%) are completely new. These data elements were created to document emerging issues such as distracted drivers, special function of vehicle, roadway information at the vehicle level, hit and run crashes, and vehicle contributing circumstances. Data elements were split to create new data elements that facilitated data collection. Some new data elements were merely transfers from the derived or linked category to the collected category. Some data elements were edited to provide clarification either in the definition or the data element name. The chart below indicates that more changes were made to the vehicle data elements. Half of the eight vehicle data elements indicated as deleted were actually combined into the data element for Motor Carrier Identification. Of the ten new vehicle data elements to be collected at the scene, six were included in the first edition of MMUCC: three were previously included in the vehicle-derived data elements, one was previously included in the vehicle-linked data elements and two were previously included in the roadway-linked data elements.

Crash Data Elements
Vehicle Data Elements
Person Data Elements
Roadway Data Elements

MMUCC Guideline, 1st Edition (1998) Compared to MMUCC Guideline, 2nd Edition (2003)

Summary Of Total Data Elements

		Original	Action Taken			Final Total
		Original	Delete	Add	Change	Final Total
Crash:	Collect	18	0	+1	+1	19
	Derived	8	0	+1	+1	9
	Linked	0	0	0	0	0
Vehicle:	Collect	28	–8	+10	+2	30
	Derived	3	–3	0	–3	0
	Linked	1	–1	0	–1	0
Person:	Collect	29	–3	+2	–1	28
	Derived	0	0	+1	+1	1
	Linked	5	–1	+2	+1	6
Roadway:	Linked	21	–3	0	–3	18
Total		113	–19	+17	–2	111

A summary of the actions taken for each data element is presented below in separate charts for the crash, vehicle, person, and roadway data elements. Data elements presented in bold in the Comments represent new attributes.

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Crash Data Elements
Changes Made to the MMUCC Guideline, 1st Edition (1998)

Crash Collected Data Elements

Element (1998)	Element (2003)	Element Name	New Def.	New Attrib.	Comments
C1	C1	Crash Case Identifier			No change.
C2	C2	Crash Date and Time	X		Time is recorded between 00:00–23:59. Midnight is coded as 00:00 to represent beginning of a new day.
C3	C3	Crash County			New reference to FIPS codes.
C4	C4	Crash City/Place			New reference to FIPS codes.
C5	C5	Crash Location	X	X	Name changed from Crash Roadway Location. Definition changed to indicate crash location as the location of the first harmful event of the crash. Lists attributes as Latitude/Longitude Coordinates, Linear Referencing System and Link Node System.
C6	C6	First Harmful Event		X	Added: Fire/Explosion, Immersion, Cargo/ Equipment Loss or Shift, Fell/Jumped FromMotor Vehicle, Thrown or Falling Object to list of non-collisions. Revised attributes for Collisions with Fixed Object as follows: Added Impact Attenuator/Crash Cushion, Bridge Overhead Structure, Bridge Pier or Support, Bridge Rail; Culvert is listed separately; separated Embankment, Ditch, Curb, split guardrail into Guardrail Face and Guardrail End, replaced median barrier with Concrete Traffic Barrier and Other Traffic Barrier, added (standing) to tree, added Traffic Sign Support, Traffic Signal Support, Other Post, Pole or Support, Fence, Mailbox, and Other Fixed Object (wall, building, tunnel, etc.), deleted work zone maintenance equipment. Coordinated attribute list for this data element with Most Harmful Event (V21).
C7	C7	Location of First Harmful Event		X	Added Separator, In Parking Lane or Zone, and Off Roadway Location Unknown to list of attributes describing location. Revised Outside Right-of-Way (trafficway).
C8	C8	Manner of Crash/Collision Impact	X	X	Clarified definition to limit this data element to crashes where the first harmful event involves a collision between two motor vehicles in transport. Angle front-to-side redefined to include Same Direction, Opposite Direction, Right Angle (includes broadside), and Angle-Direction Not Specified. Added Rear-to-Side and Other. Substituted in the Rationale: Motor Vehicle Maneuver/Action (V18) for Direction of Force that had been deleted.
C9	C9	Source of Information	X	X	Focus changed to document the affiliation of the person completing the crash report. Law Enforcement substituted for Police. Originating Agency Identifier (ORI Codes) added to name for Subfield 2. Deleted Subfield #3 for Type of Police Agency.
C10	C10	Date and Time Crash Reported to Law Enforce- ment Agency	X		Focus changed to when agency was notified as opposed to when call was placed. Law enforcement substituted for police.
C11	C11	Weather Conditions			No change.
C12	C12	Light Condition	X		Data element name changed from Ambient Light. Definition changed from type to type/level of light at the time of the crash.
C13	C13	Roadway Surface Condition		X	Data element name changed from Road Surface Condition. Added ice/frost, sand, and oil as attributes.
C14	C14	Contributing Circumstances —Environment			Expanded number of allowable entries from one to three.
C15	C15	Contributing Circumstances —Road			Added “may have” to the definition. Expanded number of allowable entries from one to three.
C16	C16	Relation to Junction	X	X	New data element created from split of C16. Data element name changed from Type of Roadway Junction. Reorganized the original attributes related to a junction under Junction Non-Interchange Area and Junction Interchange Area. Deleted shared-use paths or trails. Added Intersection, Intersection- Related, Entrance/Exit Ramp, Other Non- Interchange to Junction Non-Interchange Area. Added Thru Roadway, Intersection, Intersection- Related, Entrance/Exit Ramp, and Other Part of Interchange to the Junction Interchange Area.
C16	C17	Type of Intersection	X	X	New data element created from split of C16 Type of Roadway Junction. Data element name changed from Type of Roadway Junction. Included the original C16 attributes related to intersections. Added Intersection As Part Of Interchange. Replaced “junction” with Intersection.
C17	C18	School Bus Related	X		Expanded definition to include motor vehicles functioning as a school bus for a school-related purpose.
C18	C19	Work Zone Related			No change.

Crash Derived Data Elements

Element (1998)	Element (2003)	Element Name	New Def.	New Attrib.	Comments
CD1	CD1	Crash Severity		X	Replaced non-fatal injury with injury levels including Incapacitating (A), Non-Incapacitating (B), and Possible Injuries (C).
CD2	CD2	Number of Motor Vehicles Involved	X		Changed data element name from Number of Vehicles. Revised definition to exclude phrase “vehicles being in motion or on roadway.”
CD3	CD3	Number of Motorists			Replaced motorists with occupants in the definition.
CD4	CD4	Number of Non-Motorists			Replaced non-motorists with non-occupants and added motor vehicles not in transport to the definition.
CD5	CD5	Number of Non-Fatally Injured Persons			Changed data element name from Total Non-fatal Injuries. Revised the data source to include the Incapacitating, Non-incapacitating and Possible injuries listed in Injury Status (P4).
CD6	CD6	Number of Fatalities			Changed data element name from Total Fatalities. Added reference to Fatal Injury (K) listed in Injury Status (P4).
CD7	CD7	Alcohol Involvement			CD7 split to separate documentation for alcohol and drug involvement. Definition revised to indicate that law enforcement suspects use of alcohol by at least one driver or non-motorist involved in this crash.
CD7	CD8	Drug Involvement	X	X	New data element created from the split of CD7. Definition written to indicate that law enforcement suspects use of drugs by at least one driver or non-motorist involved in this crash.
CD8	CD9	Day of Week			No Change.

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Vehicle Data Elements
Changes Made to the MMUCC Guideline, 1st Edition (1998)

Vehicle Collected Data Elements

Element (1998)	Element (2003)	Element Name	New Def.	New Attrib.	Comments
VL1	V1	Motor Vehicle Identification Number	X	X	New data element replacing Vehicle Identification Number (VL1).
V1	V2	Motor Vehicle Unit Type and Number	X	X	Clarified code to include alphanumeric and numericcharacters. Excludes pedestrians and bicyclists. Added subfields to collect attributes for type and number. Added attributes for Type: Motor Vehicle in Transport, Parked Motor Vehicle, Working Vehicle/Equipment.
V2	V3	Motor Vehicle Registration State and Year			Changed data element name from Vehicle Registration State and Year.
V3	V4	Motor Vehicle License Plate Number			Changed data element name from Vehicle License Plate Number. Eliminated “to access the VIN” from the definition since VIN to be collected directly on the crash report.
V4	V5	Motor Vehicle Make			Changed data element name from Vehicle Make. Added reference to Appendix M for list of codes.
V5		Commercial Trailer Registration State and Year			Deleted data element.
V6		Commercial Trailer License Plate Number			Deleted data element.
VD1	V6	Motor Vehicle Model Year			New data element replacing VD1 Vehicle Model Year. Added YYYY to indicate 4-digit year. Eliminated “or VIN” from the attribute description.
VD2	V7	Motor Vehicle Model			New data element replacing VD2 Vehicle Model. Eliminated “or VIN” from the attribute description.
VD3	V8	Motor Vehicle Body Type Category	X	X	New data element replacing and revising VD3 Vehicle Body Type. Attributes include categories of vehicles. Eliminated “hard top or convertible” from the definition.
V8		Carrier Street Address			Deleted and combined information with other data elements into Motor Carrier Identification (V26).
V9		Carrier Identification Number			Deleted and combined information with other data elements into Motor Carrier Identification (V26).
V13	V9	Total Occupants in Motor Vehicle			Definition revised to include reference to injured and uninjured occupants.
V14		Vehicle Role			Deleted data element.
	V10	Special Function of Motor Vehicle in Transport	X	X	New data element to document the type of special function being served by this vehicle. Attributes include: No Special Function, Taxi, Vehicle Used as School Bus, Vehicle Used as Other Bus, Military, Police, Ambulance, Fire Truck.
V15	V11	Emergency Motor Vehicle Use			Revised definition to indicate “official” motor vehicle traveling with physical emergency signals in use.
V18	V12	Motor Vehicle Authorized Speed Limit		X	Changed data element name from Vehicle Authorized Speed Limit. Eliminated subfields and revised attributes to collect only Authorized Value in terms of miles per hour, Not Applicable and Unknown.
V19	V13	Direction of Travel Before Crash			No change.
RL8	V14	Trafficway Description	X	X	New data element replaces Trafficway Description (RL8). Added Two-Way, Not Divided With a Continuous Left Turn Lane, inserted (painted >4 feet) for unprotected median. Replaced One-way, not divided with One-Way Trafficway.
RL6	V15	Total Lanes in Roadway	X	X	New data element replaces RL6 and name changed from Lanes. Definition changed from trafficway to roadway on which vehicle involved in crash was traveling. Undivided highways, code Total “Thru” Lanes In Both Directions. Divided highways, code Total “Thru” Lanes for Roadway (on which motor vehicle was traveling).
	V16	Roadway Alignment and Grade	X	X	New data element to document the alignment and grade of the roadway at the location of the crash.
V20	V17	Traffic Control Device Type		X	Added new attribute to document a Person TCD. Also added a new subfield to document if the device was Working Properly.
V21	V18	Motor Vehicle Maneuver/ Action	X	X	Changed data element name from Vehicle Maneuver/Action. Revised data element definition to include a controlled maneuver prior to the beginning of the sequence of events. Added Negotiating a Curve. Separated Slowing, Stopped in Traffic.
V27		Most Damaged Area			Deleted and combined information with Area(s) of Impact (V19).
V22	V19	Area(s) of Impact	X	X	Data element name changed from Point of Impact. Two subfields created to collect Area of Initial Impact and Most Damaged Area using the following attributes for each: Non-Collision, 12-point clock to indicate impact area, Top (roof), Undercarriage, Unknown.
V23	V20	Sequence of Events		X	Added: Fell/Jumped From Motor Vehicle, Thrown or Falling Object to list of non-collisions. Added to list of collisions with non-fixed objects Struck By Falling, Shifting Cargo, or Anything Set in MotionBy Motor Vehicle. Revised the attributes for Collisionswith Fixed Object as follows: changed Bridge Pier or Support, replaced median barrier with Concrete Traffic Barrier and Other Traffic Barrier, added (standing) to tree, replaced highway traffic sign post with Traffic Sign Support, replaced overhead sign support with Traffic Signal Support, and deleted work zone maintenance equipment.
V24	V21	Most Harmful Event for this Motor Vehicle		X	Attributes edited to match First Harmful Event (C6).
V25		Direction of Force to Motor Vehicle			Deleted data element.
V26	V22	Underride/ Override			No change.
	V23	Hit and Run	X	X	New data element to document hit and run crashes. New attributes include No Did Not Leave Scene, Yes Driver or Car and Driver Left Scene, Unknown.
V28	V24	Extent of Damage		X	Attributes edited: No Damage and Minor Damage separated. Deleted: Severe/Vehicle Totaled to be consistent with ANSI D16.1.
	V25	Contributing Circumstances, Motor Vehicle	X	X	New data element to document motor vehicle defects and maintenance conditions that may have contributed to the crash. New attributes: Brakes, Steering, Power Train, Suspension, Tires, Wheels, Lights (head, signal, tail), Windows/Windshield, Mirrors, Wipers, Truck Coupling/Trailer Hitch/Safety Chains, Other, Unknown. Two entries are allowed.
V7	V26	Motor Carrier Identification	X	X	Revised per FMCSA requirements.
V12	V27	Gross Vehicle Weight Rating			Revised per FMCSA requirements.
V10	V28	Commercial Motor Vehicle Configuration			Revised per FMCSA requirements.
V11	V29	Commercial Cargo Body Type			Revised per FMCSA requirements.
V16	V30	Hazardous Materials Placard (Cargo Only)			Revised per FMCSA requirements.
V17		Hazardous Released (Cargo Only)			Deleted and information combined with Hazardous Materials Materials Placard (Cargo Only) (v30).

Vehicle Derived Data Elements

Element (1998)	Element Name	Comments
VD1	Vehicle Model Year	Deleted and replaced by V6.
VD2	Vehicle Model	Deleted and replaced by V7.
VD3	Vehicle Body Type	Deleted and replaced by V8.

Vehicle Linked Data Elements

Element (1998)	Element (2003)	Element Name	New Def.	New Attrib.	Comments
VL1		Vehicle Identification Number			Deleted and replaced by V1.

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Person Data Elements
Changes Made to the MMUCC Guideline, 1st Edition (1998)

Person Collected Data Elements

Element (1998)	Element (2003)	Element Name	New Def.	New Attrib.	Comments
P1	P1	Date of Birth		X	Added subfield for Age when DOB not recorded.
P2	P2	Sex			No change.
P3	P3	Person Type		X	Non-Motorist described as Pedestrian, Other Pedestrian, Bicyclist, Other Cyclist, Occupant of Motor Vehicle Not in Transport, Occupant of a Non-Motor Vehicle Transportation Device.
P4	P4	Injury Status			No change.
P5	P5	Occupant’s Motor Vehicle Unit Number			Revised data element definition to include a unique number assigned for this crash.
P6	P6	Seating Position		X	List of attributes reorganized into 3 subfields: Row Front, Second, Third, Fourth, Other, Unknown; Seat Left, Middle, Right, Other, Unknown; Other Location Not Applicable, Sleeper Section of Cab, Other Enclosed Cargo Area, Unenclosed Cargo Area, Trailing Unit, Riding on Motor Vehicle Exterior.
P7	P7	Occupant Protection System Use		X	Attributes added: Not Applicable (non-motorist), Restraint Used-Type Unknown, Child Safety Seat Used revised and expanded as Child Restraint System — Forward Facing, Child Restraint System — Rear Facing; added Booster Seat, Child Restraint Type Unknown, Other.
P8	P8	Air Bag Deployed		X	Attributes for switch status deleted. New attributes include Deployed — Other (knee, air belt, etc.), replaced Deployed — Both Front/Side with Deployed-Combination.
P9	P9	Ejection			Clarified definition. Added Not Applicable.
P10		Trapped			Deleted data element.
P11	P10	Driver License Jurisdiction			Data element name changed from Driver License State/Province.
P12 and PL1	P11	Driver License Number and Class		X	Data element name changed from Driver License Number. Deleted subfield related to whether license was a commercial driver’s license. Combined information from Driver License Class (PL1). Revised to meet FMCSA mandates.
P13	P12	Driver Name			No change.
P14	P13	Driver Actions at Time of Crash	X	X	Data element name changed from Contributing Circumstances, Driver. New attributes document Ran Off Road, Ran Red Light, Improper Backing, Improper Passing. Separated Disregarded Traffic Signs and Disregarded Other Road Markings (including signals). Replaced authorized speed limit with Exceeded Posted Speed Limit. Deleted Inattention, Distracted, Fatigued/Asleep, Operating Defective Equipment. Increased allowable entries from 2 to 4.
P15	P14	Driver Condition at Time of Crash	X		Data element name changed from Driver Condition. Revised definition to indicate “related” instead of “contributed” to crash. Deleted physical impairment from the list of attributes.
P16		Cited			Deleted data element.
P17	P15	Violation Codes			No change.
	P16	Driver Distracted By	X	X	New data element including attributes: Not Distracted, Electronic Communication Devices (cell phone, pager), Other Electronic Devices (navigation device, palm pilot, etc.), Other Inside the Vehicle, Other Outside the Vehicle, and Unknown. Data element important to document emerging issues.
P18	P17	Law Enforcement Suspects Alcohol Use			New data element created from P18. Data element name changed from Alcohol/Drug Suspected. Same list of attributes as P18 but with reference to drugs deleted.
P19	P18	Alcohol Test	X	X	Data element name changed from Alcohol. Definition expanded to include test, type and result. Deleted attributes indicating contamination. Added: BAC Test Result: Value, Pending, Unknown.
P18	P19	Law Enforcement Suspects Drug Use	X	X	New data element created from P18 to document suspected drug use. Same list of attributes as P18 but with reference to alcohol deleted.
P20	P20	Drug Test	X	X	Attributes added to indicate test status and type of result. Added reference to Drug Test (PL4) Result. Deleted attributes indicating contamination. Replaced Test Result: Names of Drugs with Drug Test Result: Positive, Negative, Unknown.
P21	P21	Non-Motorist Number			No change.
P22		Non-Motorist Type			Deleted.
P23	P22	Non-Motorist Action Prior to the Crash			Data element name changed from Non-Motorist Action. New attributes: Walking To/From School. Added (walking, running, jogging, playing, etc.) as part of Recreational Pursuit.
P24	P23	Non-Motorist Actions at Time of the Crash			Changed data element name from Contributing Circumstances, Non-Motorist. Revised definition to indicate what the non-motorist was undertaking at the time of the crash rather than what the non-motorist may have contributed to the crash.
P25	P24	Non-Motorist Condition at Time of the Crash			Data element name revised to include “at time of the crash.” Definition changed to indicate “directly related” instead of “contributed” to crash. Deleted reference to “immediately prior to a crash.” Eliminated “physical impairment” from the list of attributes.
P26	P25	Non-Motorist Location at Time of Crash			Data element name changed from Non-Motorist Location Prior to Impact. Changed definition to include time of the crash rather than prior to impact. New attributes added: Roadside, Outside Trafficway, Dedicated Bike Lane, and Inside Building. Deleted attributes related to within or beyond 10 feet of roadway.
P27	P26	Non-Motorist Safety Equipment			Added in parentheses (jacket, backpack, etc.) as examples of reflective clothing.
P28	P27	Unit Number of Motor Vehicle Striking Non-Motorist			Changed data element name from Number of Vehicle Striking Non-Motorist.
P29	P28	Transported to Medical Facility By			No change.

Person Derived Data Elements

Element (1998)	Element (2003)	Element Name	New Def.	New Attrib.	Comments
PD1	Age		X	X	New data element that derives age from Date of Birth (P1).

Person Linked Data Elements

Element (1998)	Element (2003)	Element Name	New Def.	New Attrib.	Comments
PL1		Driver License Class			Replaced by P11.
PL2	PL1	Driver License Restrictions		X	Added reference to data source for linkage. New attributes: Must Be Accompanied By an Adult, Military Vehicles Only. Entries expanded from one to three.
	PL2	Commercial Motor Vehicle Endorsements	X	X	New data element to indicate qualification level of skill to operate a specific type of commercial motor vehicle.
PLs	PL3	Driver License Status		X	Added reference to data source for linkage. Created two subfields with new attributes: Subfield 1: Type: Non CDL Driver’s License, Non CDL Restricted Driver’s License, Commercial Driver License (CDL); Subfield 2: Status: Not Licensed, Valid License, Suspended, Revoked, Expired, Canceled or Denied, Disqualified (CDL) Unknown.
	PL4	Drug Test Result	X	X	New data element to document drug name and actual test results for up to 4 different drug tests.
PL4	PL5	Injury Area			Added reference to data source for linkage.
PL5	PL6	Injury Description			Added reference to data source for linkage.

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Roadway Data Elements
Changes Made to the MMUCC Guideline, 1st Edition (1998)

Roadway Linked Data Elements

Element (1998)	Element (2003)	Element Name	New Def.	New Attrib.	Comments
RL1	RL1	Bridge/Structure Identification Number	X		Edited data element definition. Added data source for linkage.
RL2	RL2	Roadway Curvature		X	Data element name changed from Horizontal Alignment. Eliminated Subfield 1 for Alignment to eliminate duplication with V16. Added data source for linkage.
RL3	RL3	Grade			Added data source for linkage.
RL4	RL4	Part of National Highway System			Added data source for linkage.
RL5	RL5	Roadway Functional Class			Data element name changed from of Functional Class Highway. Added data source for linkage.
RL6		Lanes			Deleted and replaced by V15.
RL7	RL6	Annual Average Daily Traffic			Added data source for linkage.
RL8		Trafficway Description			Deleted and replaced by V14.
RL9	RL7	Widths of Lane(s) and Shoulder(s)			Name changed from Average Widths of the Lane(s) and Shoulder(s). Added data source for linkage. Deleted “Average” from attribute name.
RL10	RL8	Width of Median	X		Name changed from Average Width at Median. Revised data element definition. Added data source for linkage.
RL11	RL9	Access Control			Added data source for linkage.
RL12	RL10	Railway Crossing ID			Name changed from RR Crossing ID. Clarified definition. Added data source for linkage.
RL13	RL11	Roadway Lighting			Added data source for linkage.
RL14	RL12	Pavement Markings, Longitudinal			Added data source for linkage.
RL15	RL13	Bikeway			Added data source for linkage.
RL16	RL14	Delineator Presence			Clarified the data element definition. Added data source for linkage.
RL17		Intersection Type			Deleted and replaced by C16.
RL18	RL15	Traffic Control Type at Intersection			Added data source for linkage.
RL19	RL16	Mainline Number of Lanes at Intersection			Added data source for linkage.
RL20	RL17	Side-Road Number of Lanes at Intersection			Changed name from Side Road Number of Lanes. Added data source for linkage.
RL21	RL18	Total Volume of Entering Vehicles			Changed name from Mainline Approach Volumes. Added data source for linkage.

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