Are there both trucks and fences in the scene?
Yes, there are both a truck and a fence.
    src        edge_attr  dst
0     1               on    0
1     1  to the right of   15
2     2  to the right of    7
3     3  to the right of    4
4     3  to the right of    9
5     3  to the right of   10
6     3  to the right of    5
7     3   to the left of   13
8     3  to the right of   12
9     4  to the right of    9
10    4   to the left of    3
11    4  to the right of   12
12    5  to the right of   12
13    5  to the right of    9
14    5   to the left of    3
15    7   to the left of   11
16    7   to the left of    2
17    7  to the right of   15
18    9   to the left of    5
19    9   to the left of   12
20    9   to the left of    3
21    9   to the left of    4
22    9  to the right of   18
23    9  to the right of   17
24    9               on   10
25   10  to the right of   17
26   10   to the left of    3
27   11  to the right of   16
28   11  to the right of    7
29   12  to the right of    9
30   12  to the right of   17
31   12   to the left of    4
32   12   to the left of    5
33   12   to the left of    3
34   12  to the right of   18
35   13  to the right of    3
36   14   to the left of   19
37   15   to the left of    1
38   15   to the left of    7
39   16   to the left of   11
40   17   to the left of   12
41   17   to the left of   10
42   17   to the left of    9
43   18   to the left of   12
44   18   to the left of    9
45   19   to the left of   20
46   19  to the right of   14
47   20  to the right of   19