Is the signal light on the left?
No, the signal light is on the right of the image.
    src        edge_attr  dst
0     0  to the right of    9
1     1  to the right of   13
2     1  to the right of   12
3     1  to the right of    8
4     1  to the right of   16
5     1  to the right of    9
6     2   to the left of   13
7     2   to the left of   12
8     2   to the left of   16
9     2   to the left of   10
10    2   to the left of    9
11    3  to the right of    8
12    4   to the left of    7
13    4   to the left of    9
14    5   to the left of   17
15    7   to the left of   16
16    7  to the right of    4
17    8   to the left of   15
18    8   to the left of   14
19    8   to the left of   10
20    8   to the left of    3
21    8   to the left of   13
22    8   to the left of   12
23    8   to the left of    1
24    9   to the left of    0
25    9   to the left of    1
26    9  to the right of    2
27    9  to the right of    4
28    9   to the left of   10
29    9   to the left of   14
30   10  to the right of    2
31   10  to the right of    9
32   10  to the right of    8
33   12   to the left of   14
34   12  to the right of    2
35   12   to the left of    1
36   12  to the right of    8
37   12  to the right of   16
38   13  to the right of    8
39   13   to the left of   14
40   13  to the right of    2
41   13  to the right of   16
42   13   to the left of    1
43   14  to the right of   12
44   14  to the right of   13
45   14  to the right of    9
46   14  to the right of   16
47   14  to the right of    8
48   15  to the right of    8
49   16   to the left of    1
50   16  to the right of    2
51   16  to the right of    7
52   16   to the left of   13
53   16   to the left of   12
54   16   to the left of   14
55   17  to the right of    5