DI-9 Manual PDF - Utah Department of Public Safety

Note: If there is no work zone, then check the No Box.Rationale: Important to assess the impact on traffic safety of various types of on-highway workactivity when workers are present, to evaluate Traffic Control Plans used at work zones, and tomake adjustments to the Traffic Control Plans for the safety of workers and the traveling public.This data element needs to be collected at the scene because work zones are relatively short termor moving operations that are not recorded in permanent road inventory filesTotal # Lanes on RoadwayDefinition: Total number of lanes in the roadway on which this motor vehicle was traveling.• For undivided highways:Total "thru" lanes in both directions (excluding designated turn lanes).• For divided highways:Total "thru" lanes for the roadway (on which the motor vehicle under considerationwas traveling).A divided highway is a facility that is continuously separated by either a barrier or araised/depressed median between the opposing directions of traffic.Write the number of lanes in one direction of the roadway if divided and total number of lanes ifundivided roadway.Rationale: Used in studying roadway safety issues as well as identifying the environment of aparticular crash.# of Vehicles InvolvedDefinition: The total number of motor vehicles (automobiles, single-unit trucks, truckcombinations, motorcycles, etc.) that are involved in the crash. Total number of vehicles can bederived by counting the number of motor vehicles involved in a crash as indicated in Motor VehicleUnit Type and Number V2, V3, V4, etc.Write the number of vehicles involved in the crash.Rationale: Provides for the user a count of the number of motor vehicles involved in the crashwithout having to count the number of motor vehicle records. This simplifies the use of the crashdata file for producing reports in which the number of involved motor vehicles is needed.38