What sign is on the bridge?
The sign is a street sign.
    src        edge_attr  dst
0     0  to the right of   12
1     2   to the left of    5
2     2  to the right of   12
3     3   to the left of   15
4     3               on    6
5     3   to the left of   14
6     4  to the right of   12
7     5  to the right of   12
8     5  to the right of    2
9     7  to the right of   12
10    8  to the right of   15
11    9  to the right of   15
12    9               on    6
13    9          wearing    8
14   10  to the right of   15
15   12   to the left of    0
16   12   to the left of    4
17   12   to the left of    2
18   12   to the left of    7
19   12   to the left of   15
20   12   to the left of    5
21   14  to the right of    3
22   14   to the left of   15
23   15               on    6
24   15  to the right of    3
25   15   to the left of    8
26   15   to the left of    9
27   15   to the left of   10
28   15  to the right of   12
29   15  to the right of   14