Are there trains on the highway?
No, there is a bus on the highway.
    src        edge_attr  dst
0     0   to the left of    1
1     0   to the left of    9
2     0   to the left of    3
3     0   to the left of   14
4     0  to the right of    6
..  ...              ...  ...
93   19   to the left of    2
94   19  to the right of   17
95   19  to the right of   12
96   19   to the left of   11
97   20  to the right of   16

[98 rows x 3 columns]