What is on the black post?
The stop sign is on the post.
    src        edge_attr  dst
0     0      in front of    6
1     0             near    3
2     0               on    4
3     0   to the left of    3
4     0   to the left of    1
5     0   to the left of    4
6     1  to the right of    6
7     1  to the right of    4
8     1  to the right of    0
9     2  to the right of    6
10    2   to the left of    8
11    3  to the right of    0
12    3          next to    0
13    3  to the right of    6
14    3  to the right of    5
15    4   to the left of    1
16    4  to the right of    5
17    4  to the right of    6
18    4   to the left of    8
19    4  to the right of    0
20    5               on    0
21    5   to the left of    3
22    5   to the left of    4
23    6   to the left of    4
24    6   to the left of    1
25    6   to the left of    3
26    6   to the left of    2
27    6           behind    0
28    6   to the left of    8
29    7   to the left of    9
30    8  to the right of    4
31    8  to the right of    2
32    8  to the right of    6
33    9  to the right of    7