Who is on the traffic light that is not turned on?
The man is on the traffic signal.
    src        edge_attr  dst
0     0               on    5
1     1  to the right of    6
2     2  to the right of    5
3     2               on    1
4     3               on    4
5     3  to the right of    6
6     4               on    1
7     4  to the right of    6
8     5               on    1
9     5   to the left of    2
10    6   to the left of    4
11    6   to the left of    3
12    6   to the left of    1