| Name | Data Type | Definition | |
|---|---|---|---|
| GOOD | string | Good. | |
| MEDIUM_GOOD | string | Medium to good. | |
| MEDIUM | string | Medium. | |
| MEDIUM_POOR | string | Medium to poor. | |
| POOR | string | Poor. | |
| UNRELIABLE | string | The surface conditions or available friction measuring device do not permit a reliable surface friction measurement to be made. | |
| OTHER | string | Other |