What is the sign that is below the sky?
The sign is a stop sign.
    src        edge_attr  dst
0     0  to the right of    1
1     0  to the right of    3
2     1  to the right of    2
3     1   to the left of    0
4     1   to the left of    4
5     1   to the left of    5
6     2   to the left of    4
7     2   to the left of    1
8     3            below    6
9     3   to the left of    0
10    3   to the left of    4
11    3   to the left of    5
12    4  to the right of    1
13    4  to the right of    3
14    4  to the right of    2
15    5  to the right of    3
16    5  to the right of    1