| Name | Data Type | Definition | |
|---|---|---|---|
| NATURAL | string | Natural surface; no treatment. | |
| ROLLED | string | Rolled. | |
| COMPACTED | string | Compacted | |
| GRADED | string | Graded. | |
| GROOVED | string | Cut or plastic grooved. | |
| OILED | string | Oiled. | |
| PAVED | string | Paved. | |
| PFC | string | Porous friction coat. | |
| AFSC | string | Aggregate friction seal coat. | |
| RFSC | string | Rubberised friction seal coat. | |
| NON_GROOVED | string | This covers such items as 'APSHALT NON GROOVED' . | |
| OTHER | string | Other. |