What are the vehicles that are in the street?
The vehicles are cars.
    src        edge_attr  dst
0     0  to the right of    1
1     1  to the right of    2
2     1   to the left of    0
3     1  to the right of    6
4     1   to the left of   11
5     2   to the left of    6
6     2               in    1
7     2   to the left of    1
8     2   to the left of    9
9     5   to the left of   10
10    6   to the left of    1
11    6  to the right of    2
12    8               in    7
13    9  to the right of    2
14    9   to the left of   11
15   10  to the right of    5
16   10               of    9
17   10   to the left of   11
18   11  to the right of    1
19   11  to the right of   10
20   11  to the right of    9