What is on the red stop sign?
The graffiti is on the stop sign.
    src        edge_attr  dst
0     1  to the right of   14
1     1  to the right of   16
2     2               on    8
3     2   to the left of   12
4     3               in    4
..  ...              ...  ...
57   17   to the left of   16
58   17               on   18
59   18   to the left of   14
60   18   to the left of   17
61   18   to the left of   16

[62 rows x 3 columns]