What is that, a fire hydrant or a traffic light?
That is a traffic light.
    src        edge_attr  dst
0     0               on    5
1     0  to the right of   13
2     2               on   13
3     3               on    5
4     3  to the right of   13
5     4               on   13
6     4  to the right of    6
7     5  to the right of   13
8     6               in    1
9     6   to the left of    4
10    9               on   10
11    9   to the left of   12
12   10               on    8
13   11   to the left of   12
14   11               on   10
15   12  to the right of    9
16   12  to the right of   11
17   12               on   10
18   13   to the left of    3
19   13   to the left of    0
20   13   to the left of    5