Are these scooters or bikes?
These are scooters.
   src        edge_attr  dst
0    0   to the left of    7
1    0   to the left of    5
2    0   to the left of    1
3    1               on    0
4    1  to the right of    0
5    4        riding on    6
6    5  to the right of    0
7    7  to the right of    0