Is there any lamp on the street light?
No, there is a flag on the street light.
   src        edge_attr  dst
0    0               on    1
1    1  to the right of    3
2    1  to the right of    2
3    1  to the right of    4
4    2   to the left of    1
5    3     walking down    4
6    3   to the left of    1
7    4   to the left of    1