Is there a traffic light or a fence in this scene?
Yes, there is a traffic light.
   src        edge_attr  dst
0    1   to the left of    7
1    1   to the left of    4
2    4  to the right of    1
3    4   to the left of    5
4    5  to the right of    4
5    5  to the right of    6
6    6   to the left of    5
7    7  to the right of    1
8    8               on    6