RoadSurface
Surface type of the road. Check for details: https://wiki.openstreetmap.org/wiki/Key:surface
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Properties
Road with such surface type can't be used for any routing.
Heavily damaged paved roads that need maintenance: many potholes, some of them quite deep.
Paved smooth surface. The vehicle can traverse the route without significant risk of damage (e.g., to vehicle undercarriage/drivetrain) or injury (e.g., by falling).