What do you think is the sign mounted on?
The sign is mounted on the bus.
    src        edge_attr  dst
0     0   to the left of   15
1     0  to the right of    1
2     1   to the left of    4
3     1   to the left of    5
4     1   to the left of   22
..  ...              ...  ...
92   23  to the right of   16
93   23   to the left of   21
94   23   to the left of    9
95   23  to the right of   18
96   23  to the right of   19

[97 rows x 3 columns]