Surface

This extra provides info about the surface of the corresponding parts of the route.

Value	Name
0	Unknown
1	Paved
2	Unpaved
3	Asphalt
4	Concrete
5	Cobblestone
6	Metal
7	Wood
8	Compacted Gravel
9	Fine Gravel
10	Gravel
11	Dirt
12	Ground
13	Ice
14	Paving Stones
15	Sand
16	Woodchips
17	Grass
18	Grass Paver