What is the vehicle to the left of the bike?
The vehicle is a trailer.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of   13
2     1   to the left of   13
3     3   to the left of    7
4     3   to the left of    9
5     3   to the left of   16
6     3   to the left of    8
7     4  to the right of   10
8     4  to the right of    0
9     4   to the left of   13
10    4             near   16
11    5  to the right of    8
12    6   to the left of   14
13    6   to the left of   12
14    7  to the right of    3
15    7   to the left of    9
16    7  to the right of   16
17    8  to the right of    3
18    8   to the left of    5
19    8           beside    7
20    9  to the right of   16
21    9  to the right of    7
22    9  to the right of    3
23   10   to the left of    4
24   10   to the left of   13
25   12  to the right of    6
26   12  to the right of   14
27   12   to the left of   13
28   13  to the right of   10
29   13  to the right of    4
30   13  to the right of    1
31   13  to the right of    0
32   13  to the right of   14
33   13  to the right of   12
34   14  to the right of    6
35   14   to the left of   13
36   14   to the left of   12
37   16   to the left of    7
38   16   to the left of    9
39   16          next to    4
40   16  to the right of    3