Is the traffic signal in the bottom part of the picture?
Yes, the traffic signal is in the bottom of the image.
    src        edge_attr  dst
0     0   to the left of   17
1     0  to the right of   13
2     0   to the left of   26
3     0  to the right of   25
4     1   to the left of    9
5     1   to the left of   19
6     2   to the left of   17
7     2  to the right of   13
8     3   to the left of   22
9     3   to the left of    9
10    4  to the right of   22
11    4  to the right of   20
12    5   to the left of   11
13    8   to the left of   11
14    9   to the left of   14
15    9  to the right of   16
16    9  to the right of   19
17    9   to the left of   22
18    9  to the right of    3
19    9  to the right of    1
20   11  to the right of    5
21   11  to the right of    8
22   13   to the left of    0
23   13   to the left of   24
24   13   to the left of   18
25   13   to the left of    2
26   13  to the right of   25
27   14   to the left of   25
28   14  to the right of    9
29   16   to the left of   22
30   16   to the left of    9
31   17  to the right of    0
32   17  to the right of   18
33   17  to the right of   24
34   17  to the right of    2
35   18  to the right of   13
36   18   to the left of   17
37   18  to the right of   25
38   19  to the right of    1
39   19   to the left of   22
40   19   to the left of    9
41   20   to the left of    4
42   20   to the left of   23
43   21               by   14
44   22  to the right of   16
45   22  to the right of   19
46   22   to the left of   23
47   22  to the right of    3
48   22   to the left of    4
49   22  to the right of    9
50   23  to the right of   20
51   23  to the right of   22
52   24  to the right of   13
53   24   to the left of   17
54   25   to the left of   18
55   25  to the right of   14
56   25   to the left of   13
57   25   to the left of    0
58   26  to the right of    0