Are there any fire hydrants or stop signs that are not silver?
No, there is a stop sign but it is silver.
    src        edge_attr  dst
0     0  to the right of    7
1     0   to the left of    2
2     0  to the right of    8
3     1  to the right of    8
4     2  to the right of    8
5     2  to the right of    0
6     2  to the right of    7
7     4  to the right of    8
8     4  to the right of    5
9     5  to the right of    8
10    5   to the left of    4
11    5   to the left of   11
12    7  to the right of   12
13    7   to the left of    2
14    7   to the left of    0
15    8   to the left of   11
16    8   to the left of    5
17    8   to the left of    4
18    8   to the left of    0
19    8   to the left of    2
20    8   to the left of    1
21    8               on    6
22   11  to the right of    5
23   11  to the right of    8
24   12   to the left of    7