Is there either a black fire hydrant or traffic sign?
No, there is a fire hydrant but it is yellow.
    src        edge_attr  dst
0     0  to the right of   10
1     0  to the right of    3
2     0   to the left of    7
3     1  to the right of   18
4     1  to the right of    3
5     1  to the right of   13
6     2  to the right of   16
7     2   to the left of   17
8     2   to the left of   18
9     2   to the left of   13
10    3  to the right of   13
11    3   to the left of    1
12    3   to the left of    0
13    3  to the right of   18
14    3   to the left of    7
15    3  to the right of   17
16    4   to the left of    7
17    4  to the right of   10
18    5  to the right of   11
19    5   to the left of   10
20    7  to the right of    3
21    7  to the right of    0
22    7  to the right of   10
23    7  to the right of    4
24    8   to the left of   10
25    8   to the left of    9
26    9  to the right of   10
27    9  to the right of    8
28   10   to the left of    4
29   10   to the left of    0
30   10   to the left of    9
31   10  to the right of    5
32   10  to the right of    8
33   10  to the right of   14
34   10  to the right of   12
35   10   to the left of    7
36   11   to the left of    5
37   12  to the right of   14
38   12   to the left of   10
39   13  to the right of   17
40   13   to the left of    3
41   13   to the left of    1
42   13  to the right of    2
43   14   to the left of   12
44   14   to the left of   10
45   16   to the left of   17
46   16   to the left of    2
47   17  to the right of   16
48   17  to the right of    2
49   17   to the left of   13
50   17   to the left of    3
51   17   to the left of   18
52   18   to the left of    3
53   18   to the left of    1
54   18  to the right of   17
55   18  to the right of    2