What is the fence in front of?
The fence is in front of the cars.
    src        edge_attr  dst
0     0  to the right of   10
1     0      in front of   10
2     0  to the right of   11
3     0  to the right of    1
4     0  to the right of    7
5     1   to the left of    0
6     1  to the right of   11
7     2  to the right of   11
8     4   to the left of   14
9     4   to the left of    8
10    4   to the left of    6
11    4   to the left of    9
12    5   to the left of    9
13    5               on    6
14    5  to the right of   11
15    6  to the right of    4
16    6  to the right of   11
17    7   to the left of    0
18    7               in    2
19    7  to the right of   11
20    8  to the right of    4
21    8  to the right of   14
22    8  to the right of   11
23    9  to the right of    5
24    9  to the right of    4
25    9  to the right of   11
26   10  to the right of   11
27   10   to the left of    0
28   10           behind    0
29   11   to the left of    5
30   11   to the left of    0
31   11   to the left of    8
32   11   to the left of    2
33   11   to the left of    7
34   11   to the left of    6
35   11   to the left of    1
36   11   to the left of   14
37   11   to the left of    9
38   11   to the left of   10
39   12  to the right of   16
40   12    surrounded by   15
41   14  to the right of   11
42   14  to the right of    4
43   14  to the right of   17
44   14   to the left of    8
45   15      surrounding   12
46   15  to the right of   16
47   16   to the left of   12
48   16   to the left of   15
49   17   to the left of   14