0 0 Fast lane between the wheel tracks
1 1 Fast lane between the wheel tracks in the opposite direction
2 2 Fast lane in the wheel tracks
3 3 Fast lane in the wheel tracks in the opposite direction
4 4 Slow lane between the wheel tracks
5 5 Slow lane between the wheel tracks in the opposite direction
6 6 Slow lane in the wheel tracks
7 7 Slow lane in the wheel tracks in the opposite direction
15 15 Missing value
