Do you see any street sign in the photo that is black?
No, there is a street sign but it is yellow.
    src        edge_attr  dst
0     0  to the right of    4
1     0   to the left of    6
2     0   to the left of    5
3     1  to the right of   10
4     2  to the right of    8
5     4   to the left of    9
6     4   to the left of    0
7     4   to the left of   10
8     5   to the left of    8
9     5  to the right of    0
10    6  to the right of    0
11    6   to the left of    8
12    7  to the right of   12
13    8  to the right of   13
14    8   to the left of   11
15    8   to the left of    2
16    8  to the right of    6
17    8  to the right of    5
18    9  to the right of    4
19   10   to the left of    1
20   10  to the right of    4
21   10   to the left of   11
22   11  to the right of    8
23   11  to the right of   10
24   12   to the left of    7
25   12   to the left of   13
26   12   to the left of   14
27   13  to the right of   12
28   13   to the left of    8
29   14  to the right of   12