On which side of the photo is the signal light?
The signal light is on the left of the image.
    src        edge_attr  dst
0     0  to the right of   11
1     2  to the right of    9
2     3  to the right of    9
3     5  to the right of    9
4     5  to the right of    8
5     8   to the left of    5
6     9   to the left of    3
7     9   to the left of    2
8     9  to the right of   11
9     9   to the left of    5
10   11   to the left of    9
11   11   to the left of    0