Which side is the traffic signal on?
The traffic signal is on the right of the image.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of    3
2     0   to the left of    4
3     1  to the right of    3
4     1  to the right of    6
5     3   to the left of    8
6     3   to the left of    7
7     3   to the left of    1
8     3  to the right of    0
9     3   to the left of    6
10    3  to the right of   12
11    4   to the left of    6
12    4  to the right of    0
13    4            under   11
14    4            below   11
15    5  to the right of   12
16    6  to the right of    4
17    6   to the left of   10
18    6  to the right of    3
19    6   to the left of    1
20    7               on    8
21    7  to the right of    3
22    8  to the right of    3
23    9  to the right of   12
24   10  to the right of    6
25   11  to the right of    0
26   11            above    4
27   12   to the left of    5
28   12   to the left of    3
29   12   to the left of    9