Are there either helmets or traffic lights that are black?
Yes, the traffic light is black.
    src        edge_attr  dst
0     0  to the right of    3
1     0   to the left of   15
2     0  to the right of   19
3     0  to the right of   10
4     0  to the right of   17
..  ...              ...  ...
91   19   to the left of    0
92   19  to the right of   10
93   20  to the right of   10
94   20  to the right of   13
95   20  to the right of   17

[96 rows x 3 columns]