What color is that traffic light?
The traffic light is red.
    src        edge_attr  dst
0     1  to the right of    3
1     2  to the right of    5
2     2  to the right of    6
3     3   to the left of    1
4     5   to the left of    2
5     5             near    6
6     5   to the left of    7
7     6   to the left of    2
8     6   to the left of    7
9     6             near    5
10    7  to the right of    5
11    7   to the left of    8
12    7  to the right of    6
13    8  to the right of    7