Is the white letter on the sign that is on the pole?
Yes, the letter is on the sign.
    src        edge_attr  dst
0     0               on    6
1     0   to the left of    9
2     0   to the left of    2
3     0      in front of   10
4     2  to the right of    3
5     2  to the right of    0
6     3   to the left of    2
7     3               on    0
8     4  to the right of    6
9     4   to the left of    5
10    5  to the right of    4
11    6   to the left of   12
12    6  to the right of   11
13    6   to the left of    4
14    7               on    0
15    7   to the left of    9
16    9  to the right of    0
17    9  to the right of    7
18   11   to the left of    6
19   12  to the right of    6