What vehicle isn't parked?
The vehicle is a truck.
    src        edge_attr  dst
0     0        on top of   14
1     0   to the left of   13
2     3        on top of   14
3     3  to the right of    4
4     4   to the left of    3
5     6  to the right of   17
6     7  to the right of   17
7     8   to the left of   15
8     9          wearing    4
9     9          wearing   14
10    9          wearing   17
11    9          holding    6
12    9          wearing    2
13   13  to the right of    0
14   15  to the right of    8
15   17   to the left of    7
16   17   to the left of    6