Is there a traffic light or a flag in the picture?
No, there are no flags or traffic lights.
    src        edge_attr  dst
0     0  to the right of   11
1     1  to the right of   13
2     1   to the left of   11
3     1   to the left of   10
4     1  to the right of    3
5     2   to the left of   16
6     2  to the right of   11
7     3   to the left of   13
8     3   to the left of   11
9     3   to the left of    1
10    4   to the left of    9
11    4   to the left of   11
12    4   to the left of   13
13    4               on    3
14    5   to the left of    9
15    5   to the left of   13
16    6  to the right of   13
17    7  to the right of    8
18    7  to the right of   13
19    8   to the left of   18
20    8   to the left of   14
21    8   to the left of    7
22    9  to the right of    5
23    9  to the right of    4
24    9  to the right of   13
25    9   to the left of   11
26   10  to the right of    1
27   10               on   11
28   11   to the left of    0
29   11  to the right of    1
30   11  to the right of    4
31   11   to the left of    2
32   11  to the right of    3
33   11  to the right of    9
34   11   to the left of   15
35   11  to the right of   13
36   11   to the left of   16
37   12  to the right of   17
38   12  to the right of   14
39   12  to the right of   18
40   13   to the left of    9
41   13   to the left of   11
42   13   to the left of    7
43   13  to the right of    3
44   13  to the right of    4
45   13  to the right of    5
46   13   to the left of    6
47   13   to the left of    1
48   14  to the right of    8
49   14   to the left of   12
50   15               on   16
51   15  to the right of   11
52   16  to the right of   11
53   16  to the right of    2
54   17   to the left of   12
55   18   to the left of   12
56   18  to the right of    8