Are there red fire hydrants or traffic lights?
No, there is a traffic light but it is yellow.
   src        edge_attr  dst
0    0  to the right of    7
1    1             near    2
2    2             near    1
3    2  to the right of    6
4    3            below    8
5    3   to the left of    4
6    4  to the right of    3
7    6   to the left of    2
8    7   to the left of    0
9    8            above    3