Are there any bikes or cars?
Yes, there is a bike.
   src        edge_attr  dst
0    1   to the left of    8
1    2   to the left of    8
2    4   to the left of    8
3    5   to the left of    8
4    8  to the right of    1
5    8  to the right of    5
6    8  to the right of    2
7    8  to the right of    4