What is the sign on?
The sign is on the pole.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of    3
2     1  to the right of    8
3     1  to the right of    2
4     1  to the right of    4
5     2  to the right of   12
6     2               on    9
7     2  to the right of   14
8     2   to the left of    1
9     3  to the right of    0
10    3  to the right of    5
11    3  to the right of    7
12    3  to the right of   11
13    3  to the right of   14
14    3  to the right of   12
15    4   to the left of    1
16    4   to the left of    6
17    5  to the right of    0
18    5   to the left of    3
19    5  to the right of    7
20    5   to the left of   10
21    6  to the right of    4
22    7   to the left of    3
23    7   to the left of    5
24    8               on    2
25    8   to the left of    1
26    8  to the right of   12
27    9   to the left of   13
28    9  to the right of   10
29   10   to the left of    9
30   10  to the right of    5
31   11   to the left of    3
32   11   to the left of   14
33   12   to the left of    2
34   12   to the left of    3
35   12   to the left of    8
36   13  to the right of    9
37   14  to the right of   11
38   14   to the left of    3
39   14   to the left of    2