Which kind of vehicle is small?
The vehicle is cars.
    src        edge_attr  dst
0     0  to the right of    1
1     0   to the left of   15
2     0   to the left of    3
3     0   to the left of   12
4     0               on   12
5     0   to the left of   11
6     0   to the left of   16
7     0  to the right of    5
8     1               in    9
9     1   to the left of   10
10    1   to the left of    0
11    2   to the left of    7
12    2  to the right of    5
13    2  to the right of    6
14    3  to the right of    0
15    3  to the right of   16
16    4  to the right of   10
17    4   to the left of   13
18    5   to the left of    2
19    5   to the left of   10
20    5   to the left of    0
21    6   to the left of   10
22    6   to the left of    2
23    7   to the left of   13
24    7  to the right of    2
25    8               on   12
26    9   to the left of   10
27   10  to the right of    9
28   10  to the right of    5
29   10   to the left of    4
30   10  to the right of    1
31   10  to the right of    6
32   10   to the left of   17
33   11         carrying    3
34   11  to the right of    0
35   11  to the right of   16
36   11         crossing   12
37   12  to the right of    0
38   13  to the right of   17
39   13  to the right of    4
40   13  to the right of    7
41   15               on   12
42   15  to the right of   16
43   15  to the right of    0
44   16   to the left of   15
45   16   to the left of    3
46   16               on   12
47   16   to the left of   11
48   16  to the right of    0
49   17  to the right of   10
50   17   to the left of   13