Is there a motorcycle on the road?
No, there is a bus on the road.
    src        edge_attr  dst
0     1   to the left of    7
1     1   to the left of    6
2     2               on    0
3     2   to the left of    7
4     3               on    6
5     4   to the left of    7
6     6  to the right of    1
7     7  to the right of    1
8     7  to the right of    2
9     7  to the right of    4
10    7  to the right of    8
11    8               on    4
12    8   to the left of    7