What is the stop sign in front of?
The stop sign is in front of the van.
    src          edge_attr  dst
0     0     to the left of    9
1     0    to the right of    4
2     0     to the left of   17
3     0     parked next to   16
4     0     to the left of    2
5     1     to the left of    8
6     1        in front of    8
7     1         hanging on    4
8     2    to the right of    0
9     2     to the left of   17
10    2    to the right of    4
11    3               near   12
12    3  sitting on top of   13
13    3        in front of    8
14    3    to the right of    6
15    3     to the left of   10
16    3     to the left of   11
17    3    to the right of   12
18    3         sitting on   13
19    4     to the left of    2
20    4     to the left of    0
21    4     to the left of    8
22    4     to the left of    6
23    4     to the left of    9
24    6     to the left of   17
25    6     to the left of    3
26    6    to the right of    4
27    8    to the right of    1
28    8    to the right of    4
29    8             behind    1
30    8             behind    3
31    9    to the right of    0
32    9    to the right of    4
33    9     to the left of   17
34    9         walking on    6
35   10     to the left of   11
36   10    to the right of    3
37   10          on top of    7
38   10     to the left of   15
39   11    to the right of    3
40   11    to the right of   10
41   11     to the left of   15
42   12            next to    3
43   12     to the left of   17
44   12     to the left of   14
45   12     to the left of    3
46   13     to the left of   17
47   14    to the right of   12
48   15    to the right of   10
49   15    to the right of   11
50   16     to the left of   17
51   17             inside   15
52   17    to the right of   13
53   17    to the right of    9
54   17    to the right of    6
55   17    to the right of    2
56   17    to the right of    0
57   17    to the right of   16
58   17    to the right of   12