Is there any traffic light on the green pole?
No, there is a clock on the pole.
    src        edge_attr  dst
0     0   to the left of    9
1     1   to the left of    4
2     1  to the right of   14
3     1   to the left of   13
4     2  to the right of   10
5     2   to the left of    4
6     2   to the left of   13
7     2  to the right of   12
8     4  to the right of    6
9     4  to the right of    5
10    4  to the right of   14
11    4  to the right of   11
12    4  to the right of   15
13    4  to the right of    2
14    4  to the right of    1
15    5   to the left of    7
16    5   to the left of    4
17    5   to the left of   13
18    6               on   14
19    6   to the left of    4
20    7  to the right of    5
21    7  to the right of   14
22    7  to the right of   15
23    9  to the right of   12
24    9  to the right of    0
25   10   to the left of    2
26   11   to the left of    4
27   12   to the left of    2
28   12   to the left of    9
29   13  to the right of   14
30   13  to the right of    5
31   13  to the right of    2
32   13  to the right of    1
33   14   to the left of    7
34   14   to the left of    1
35   14   to the left of    4
36   14   to the left of   13
37   15   to the left of    7
38   15   to the left of    4