Do you see cars or fences?
Yes, there is a fence.
    src        edge_attr  dst
0     0  to the right of   11
1     0   to the left of    5
2     0   to the left of   13
3     2  to the right of   15
4     2  to the right of   10
5     3   to the left of   12
6     4   to the left of    9
7     5  to the right of    8
8     5  to the right of    0
9     5  to the right of   11
10    7  to the right of   11
11    8   to the left of    5
12    8   to the left of   10
13    8   to the left of   12
14    9  to the right of    4
15   10  to the right of    8
16   10   to the left of    2
17   11   to the left of    7
18   11   to the left of    5
19   11   to the left of    0
20   12  to the right of    3
21   12  to the right of    8
22   13  to the right of   17
23   13  to the right of    0
24   15   to the left of    2
25   17   to the left of   13