Is the color of the sign different than the cart?
Yes, the cart is black and the sign is white.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    2
2     2  to the right of   10
3     2  to the right of    6
4     2  to the right of   13
5     2  to the right of    0
6     2  to the right of    3
7     3  to the right of    0
8     3  to the right of   10
9     3  to the right of   13
10    3  to the right of    6
11    3   to the left of    2
12    4   to the left of   12
13    4  to the right of   15
14    6   to the left of    3
15    6   to the left of    2
16    7   to the left of   10
17    7   to the left of    9
18    7   to the left of   11
19    8  to the right of   10
20    8  to the right of   11
21    9  to the right of   11
22    9  to the right of    7
23   10   to the left of    2
24   10   to the left of    3
25   10   to the left of   16
26   10   to the left of   14
27   10  to the right of    7
28   10   to the left of    8
29   10  to the right of   15
30   11   to the left of    9
31   11   to the left of    8
32   11  to the right of    7
33   12  to the right of    4
34   13   to the left of    3
35   13   to the left of    2
36   14               on    9
37   14   to the left of   16
38   14  to the right of   10
39   15   to the left of   10
40   15   to the left of    4
41   16  to the right of   14
42   16  to the right of   10