What is common to the sign and the seat?
The color, both the sign and the seat are black.
    src        edge_attr  dst
0     0   to the left of   17
1     0   to the left of    8
2     0   to the left of   16
3     1  to the right of   19
4     1   to the left of    8
..  ...              ...  ...
70   21  to the right of   19
71   22   to the left of   16
72   22             with   23
73   23   to the left of   16
74   23   to the left of   17

[75 rows x 3 columns]