Are the cars in the top or in the bottom part?
The cars are in the bottom of the image.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of   12
2     1   to the left of   13
3     1   to the left of   12
4     2   to the left of   13
5     2   to the left of   12
6     3   to the left of   10
7     3   to the left of    4
8     3   to the left of   14
9     4   to the left of   14
10    4   to the left of   10
11    4  to the right of    3
12    5   to the left of    7
13    6   to the left of   12
14    6   to the left of   13
15    7  to the right of    5
16    7  to the right of   12
17    7  to the right of   15
18    9   to the left of   12
19    9   to the left of   13
20   10  to the right of    3
21   10  to the right of    4
22   10  to the right of   14
23   11   to the left of   13
24   11   to the left of   12
25   12  to the right of    0
26   12  to the right of    6
27   12  to the right of    2
28   12  to the right of    1
29   12  to the right of   11
30   12  to the right of    9
31   12   to the left of    7
32   13  to the right of    1
33   13  to the right of    6
34   13  to the right of    9
35   13  to the right of   11
36   13  to the right of    2
37   13  to the right of    0
38   14   to the left of   10
39   14  to the right of    3
40   14  to the right of    4
41   15   to the left of    7