Do you see a bus on the road?
No, there are trucks on the road.
    src        edge_attr  dst
0     0  to the right of    2
1     0  to the right of    7
2     0   to the left of    3
3     2   to the left of    0
4     3  to the right of    0
5     3  to the right of    7
6     3  to the right of    8
7     3  to the right of    6
8     6   to the left of    9
9     6   to the left of    3
10    7               on    6
11    7   to the left of    0
12    7   to the left of    9
13    7   to the left of    3
14    8               in    1
15    8   to the left of    3
16    8  to the right of   10
17    9  to the right of    7
18    9  to the right of    6
19   10   to the left of    8