Is there a fence behind the green bus?
Yes, there is a fence behind the bus.
    src        edge_attr  dst
0     0   to the left of    9
1     0  to the right of    7
2     3           behind    8
3     3           behind    7
4     4   to the left of    9
5     4  to the right of   12
6     4   to the left of    8
7     5   to the left of    7
8     5           behind    8
9     5           behind    7
10    5   to the left of   11
11    7   to the left of    8
12    7      in front of    5
13    7      in front of    3
14    7   to the left of    0
15    7   to the left of    9
16    7  to the right of    5
17    7               on    2
18    8  to the right of    4
19    8      in front of    5
20    8      in front of    3
21    8  to the right of   11
22    8  to the right of    7
23    8               on    2
24    9  to the right of    4
25    9  to the right of    7
26    9  to the right of    0
27   11   to the left of    8
28   11  to the right of    5
29   12   to the left of    4