Is there either a red stop sign or truck?
Yes, there is a red stop sign.
    src       edge_attr  dst
0     0  to the left of    7
1     0  to the left of    5
2     0  to the left of   12
3     1  to the left of    5
4     1  to the left of    2
..  ...             ...  ...
59   14  to the left of    1
60   14  to the left of   13
61   14  to the left of   12
62   14  to the left of    4
63   14  to the left of    7

[64 rows x 3 columns]