What kind of vehicle is not parked, the cab or the truck?
The cab is not parked.
    src        edge_attr  dst
0     0  to the right of   11
1     1  to the right of   14
2     1   to the left of    5
3     1   to the left of   10
4     1  to the right of    8
5     3  to the right of    6
6     3               in    2
7     3   to the left of    9
8     4               in    2
9     4  to the right of    7
10    4  to the right of   15
11    5  to the right of   10
12    5  to the right of    1
13    6   to the left of    3
14    6   to the left of    9
15    6               in    2
16    7               in    2
17    7   to the left of    4
18    7  to the right of   15
19    8   to the left of    1
20    8   to the left of   14
21    9  to the right of   13
22    9  to the right of    6
23    9  to the right of    3
24   10  to the right of    1
25   10   to the left of    5
26   10   to the left of   11
27   10  to the right of   14
28   11   to the left of    0
29   11  to the right of   10
30   13   to the left of    9
31   14  to the right of    8
32   14   to the left of   10
33   14   to the left of    1
34   15               in    2
35   15   to the left of    7
36   15   to the left of    4