What's on the pole?
The street sign is on the pole.
    src        edge_attr  dst
0     0  to the right of   10
1     1   to the left of   12
2     1  to the right of    5
3     2   to the left of    4
4     4  to the right of   11
5     4  to the right of    8
6     4  to the right of   12
7     4  to the right of    7
8     4  to the right of    2
9     5   to the left of    1
10    5   to the left of   12
11    6       mounted on    4
12    6  to the right of    7
13    7   to the left of    6
14    7   to the left of    4
15    7  to the right of    9
16    8   to the left of    4
17    9   to the left of    7
18   10   to the left of    0
19   11   to the left of    4
20   12  to the right of    5
21   12   to the left of    4
22   12               on    4
23   12  to the right of    1