Where are the people standing on?
The people are standing on the road.
   src        edge_attr  dst
0    0            below    8
1    1      standing on    2
2    1               on    2
3    1  to the right of    3
4    3   to the left of    1
5    4               on    8
6    4   to the left of    6
7    6  to the right of    4
8    8               on    0