What is driving on the ground?
The car is driving on the ground.
   src        edge_attr  dst
0    1  to the right of    6
1    3  to the right of    7
2    3   to the left of    6
3    3       driving on   11
4    4   to the left of    7
5    6  to the right of    3
6    6   to the left of    1
7    7   to the left of    3
8    7  to the right of    4
9    7       walking on   11