On which side are the cars?
The cars are on the left of the image.
    src        edge_attr  dst
0     0   to the left of   10
1     0   to the left of    4
2     4   to the left of    6
3     4  to the right of    0
4     6  to the right of   10
5     6  to the right of    4
6     9  to the right of   10
7    10  to the right of    0
8    10   to the left of    6
9    10   to the left of    9
10   10      standing on    5
11   10       walking on    5