What are the vehicles in the parking lot called?
The vehicles are cars.
    src        edge_attr  dst
0     0               on    9
1     0   to the left of   15
2     1   to the left of    4
3     1           behind    4
4     3            below   12
5     4  to the right of    7
6     4      in front of    1
7     4               on    3
8     4  to the right of    1
9     4  to the right of   10
10    6   to the left of   13
11    7  to the right of   10
12    7   to the left of    4
13    9   to the left of   15
14    9   to the left of   11
15   10               in   11
16   10   to the left of    4
17   10   to the left of    7
18   11  to the right of   15
19   11  to the right of    9
20   13  to the right of    6
21   15  to the right of    0
22   15  to the right of    9
23   15   to the left of   11
24   15  to the right of   16
25   16   to the left of   15