Are there both a traffic light and a street sign in this picture?
Yes, there are both a street sign and a traffic light.
    src        edge_attr  dst
0     0   to the left of   20
1     0  to the right of   12
2     2  to the right of   13
3     2  to the right of   25
4     3       hanging on    8
5     4       hanging on    8
6     5   to the left of    6
7     6  to the right of    5
8     7   to the left of   22
9     7   to the left of   11
10    7  to the right of   16
11    7   to the left of   18
12    7   to the left of   21
13    8   to the left of   24
14    8         carrying   14
15    8       sitting on   23
16    8      in front of   19
17   10   to the left of   18
18   10   to the left of   11
19   10   to the left of   24
20   10   to the left of   22
21   10   to the left of   21
22   11   to the left of   24
23   11  to the right of   10
24   11  to the right of    7
25   12   to the left of    0
26   13   to the left of    2
27   13  to the right of   25
28   14        on top of    8
29   16  to the right of   25
30   16   to the left of    7
31   17       sitting on   15
32   18   to the left of   24
33   18  to the right of   10
34   18  to the right of    7
35   18               in   23
36   19           behind    8
37   20  to the right of    0
38   20    hanging above    8
39   21  to the right of   10
40   21  to the right of    7
41   21      standing on   23
42   22      standing in   23
43   22  to the right of   10
44   22               in   23
45   22  to the right of    7
46   24  to the right of   18
47   24  to the right of   10
48   24  to the right of   11
49   24  to the right of    8
50   24      standing in   23
51   24               in   23
52   25   to the left of    2
53   25      standing in   23
54   25               in   23
55   25   to the left of   13
56   25   to the left of   16