Where is the sign?
The sign is on the runway.
    src        edge_attr  dst
0     0           behind    3
1     1           behind   11
2     2  to the right of    7
3     2            above   10
4     2  to the right of   11
5     3      in front of   11
6     3               on    6
7     4   to the left of   10
8     4   to the left of    9
9     7   to the left of    2
10    7               of    3
11    9               by   10
12    9  to the right of    4
13    9   to the left of   10
14    9               by    4
15   10  to the right of    4
16   10  to the right of    9
17   11   to the left of    2
18   12               on    6
19   12               by    3