| Data file | Cases | Variables | 
|---|---|---|
| type1 This file contains the general details of the accident | 34463 | 20 | 
| type2 This file contains the details about the vehicles and the drivers involved with the accident. For a record in file Type 1 there can be multiple records in this file depending on the number of vehicles involved. | 55712 | 19 | 
| type3 This file contains the details about the casualties caused by the accident. For a record in file Type 1 there can be multiple records in this file depending on the number of casualties caused. | 15797 | 15 | 
| type4 This file contains the party at fault. This is a special record included in the system from 1987 | 34583 | 8 |