What kind of vehicle is to the left of the fence?
The vehicles are cars.
    src        edge_attr  dst
0     0  to the right of   12
1     1               on   10
2     1   to the left of    5
3     2   to the left of    5
4     2   to the left of    4
5     3               on    2
6     3   to the left of    4
7     3  to the right of    6
8     3   to the left of    5
9     4  to the right of    3
10    4  to the right of    2
11    4  to the right of    6
12    5  to the right of   10
13    5  to the right of    6
14    5  to the right of    1
15    5  to the right of    3
16    5  to the right of    2
17    6   to the left of    3
18    6   to the left of    4
19    6   to the left of    5
20   10   to the left of    5
21   12   to the left of    0