What do the sign and the streetlight have in common?
The color, both the sign and the streetlight are white.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of    9
2     0   to the left of    2
3     0   to the left of    8
4     0   to the left of    7
5     1  to the right of   12
6     2  to the right of    7
7     2  to the right of    0
8     4  to the right of    7
9     4  to the right of    9
10    4  to the right of    0
11    5  to the right of    7
12    6  to the right of    7
13    7   to the left of    5
14    7   to the left of    4
15    7   to the left of    2
16    7  to the right of    0
17    7   to the left of    6
18    8  to the right of    0
19    9               on    7
20    9   to the left of    4
21    9  to the right of    0
22   10  to the right of   11
23   11   to the left of   10
24   12   to the left of    1