Are there any traffic lights?
No, there are no traffic lights.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of    2
2     0  to the right of    9
3     1      eating from    5
4     1   to the left of    5
5     1  to the right of    7
6     1  to the right of    6
7     1  to the right of    2
8     1  to the right of   11
9     1  to the right of    8
10    2   to the left of    1
11    2   to the left of    0
12    2   to the left of    5
13    2      standing in    9
14    2   to the left of   10
15    3   to the left of   10
16    5  to the right of    1
17    5  to the right of    2
18    6   to the left of    1
19    6   to the left of    7
20    7               of    2
21    7   to the left of    0
22    7  to the right of    6
23    7   to the left of    1
24    8   to the left of    1
25    8   to the left of   11
26    8   to the left of   10
27    9   to the left of    0
28   10  to the right of    2
29   10  to the right of    3
30   10  to the right of    8
31   11       hanging on   10
32   11  to the right of    8
33   11   to the left of    1