What's covering the sign?
The graffiti is covering the sign.
    src        edge_attr  dst
0     0  to the right of   11
1     2  to the right of    9
2     3   to the left of   12
3     3   to the left of    9
4     4   to the left of    9
5     5   to the left of    9
6     8               on   11
7     8   to the left of   12
8     9       covered by   10
9     9  to the right of   15
10    9  to the right of    4
11    9  to the right of    3
12    9  to the right of    5
13    9               on   11
14    9   to the left of    2
15   10               on    9
16   10         covering    9
17   11   to the left of   13
18   11   to the left of   12
19   11   to the left of    0
20   12  to the right of    3
21   12             with   13
22   12  to the right of    8
23   12  to the right of   11
24   13          next to   15
25   13             near   15
26   13  to the right of   11
27   15               on    9
28   15   to the left of    9
29   15     covered with   10
30   15             near   13