Are there traffic lights or fences?
No, there are no traffic lights or fences.
    src        edge_attr  dst
0     1  to the right of    3
1     1  to the right of    7
2     2  to the right of    8
3     3  to the right of    6
4     3   to the left of    1
5     4         covering   13
6     5   to the left of    8
7     5  to the right of   10
8     6   to the left of    3
9     7   to the left of    1
10    8               on   14
11    8            above   15
12    8        on top of   14
13    8  to the right of   12
14    8  to the right of    5
15    8   to the left of    2
16    8  to the right of   11
17    8  to the right of   10
18   10   to the left of    5
19   10   to the left of    8
20   11   to the left of    8
21   11               on   12
22   12   to the left of    8
23   13        on top of   14
24   13       covered by    4
25   15               on   14
26   15            below    8
27   16               of   15