Do you see both buses and cars there?
No, there is a bus but no cars.
    src        edge_attr  dst
0     0   to the left of   13
1     0  to the right of   10
2     1   to the left of   11
3     1   to the left of    5
4     1   to the left of    2
5     1   to the left of   10
6     1   to the left of   14
7     2   to the left of    8
8     2  to the right of    1
9     3  to the right of    8
10    3  to the right of   12
11    3  to the right of    6
12    5  to the right of    1
13    6   to the left of   13
14    6  to the right of   10
15    6   to the left of   12
16    6   to the left of    3
17    6   to the left of   16
18    8  to the right of   11
19    8  to the right of    2
20    8  to the right of   10
21    8  to the right of   14
22    8   to the left of   13
23    8   to the left of    9
24    8   to the left of   12
25    8   to the left of    3
26    8   to the left of   16
27    9  to the right of   12
28    9  to the right of    8
29   10   to the left of    8
30   10  to the right of   17
31   10   to the left of    6
32   10  to the right of    1
33   10   to the left of    0
34   11  to the right of    1
35   11  to the right of   17
36   11   to the left of    8
37   12  to the right of    6
38   12  to the right of    8
39   12   to the left of    3
40   12   to the left of    9
41   12   to the left of   16
42   13  to the right of    6
43   13  to the right of    8
44   13  to the right of    0
45   14  to the right of    1
46   14   to the left of    8
47   16  to the right of   12
48   16  to the right of    6
49   16  to the right of    8
50   17   to the left of   10
51   17   to the left of   11