| value | description |
|---|---|
| clearanceWorkOnCarriageway | |
| clearingAction | |
| installationWork | |
| grassCuttingWork | |
| maintenanceWork | |
| overrunningRoadworks | |
| repairWork | |
| resurfacingWork | |
| roadMarkingWork | |
| roadsideWork | |
| roadworkClearanceInProgress | |
| roadworks | |
| rockFallPreventativeMaintenance | |
| saltingInProgress | |
| snowploughsInUse | |
| treeAndVegetationCuttingWork | |
| other |