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