Which place is it?
It is a road.
   src        edge_attr  dst
0    0   to the left of    6
1    0  to the right of    1
2    1   to the left of    3
3    1   to the left of    5
4    1   to the left of    0
5    3  to the right of    1
6    5  to the right of    1
7    6  to the right of    7
8    6  to the right of    0
9    7   to the left of    6