Are there any cars or buses?
Yes, there is a bus.
    src        edge_attr  dst
0     0  to the right of   19
1     0   to the left of   17
2     0  to the right of    1
3     0   to the left of    8
4     0   to the left of   14
..  ...              ...  ...
76   19   to the left of    0
77   19   to the left of    1
78   19   to the left of   17
79   19   to the left of   14
80   19   to the left of    8

[81 rows x 3 columns]