What color is the street sign on the other street sign?
The street sign is white.
   src        edge_attr  dst
0    1  to the right of    4
1    1               on    4
2    1  to the right of    2
3    2               on    4
4    2               on    2
5    2   to the left of    1
6    2   to the left of    4
7    4  to the right of    2
8    4   to the left of    1