Do you see any trucks in the picture that are not black?
Yes, there is a white truck.
    src        edge_attr  dst
0     0   to the left of   11
1     0   to the left of    8
2     0  to the right of   17
3     1   to the left of    3
4     1   to the left of   15
5     1   to the left of    6
6     1               in   18
7     3  to the right of   12
8     3  to the right of   16
9     3  to the right of   15
10    3  to the right of    4
11    3  to the right of   11
12    3  to the right of    1
13    3  to the right of    8
14    4   to the left of   15
15    4   to the left of    3
16    5  to the right of   13
17    5  to the right of    7
18    5  to the right of   17
19    6  to the right of    1
20    7   to the left of    5
21    7   to the left of   13
22    8  to the right of    9
23    8   to the left of    3
24    8  to the right of    0
25    8   to the left of   15
26    9   to the left of    8
27    9   to the left of   11
28   11  to the right of    0
29   11   to the left of   12
30   11  to the right of    9
31   11   to the left of    3
32   11   to the left of   15
33   12   to the left of    3
34   12  to the right of   11
35   12               on    4
36   12   to the left of   15
37   13   to the left of    5
38   13  to the right of    7
39   13  to the right of   17
40   15   to the left of    3
41   15  to the right of    1
42   15  to the right of    4
43   15  to the right of    8
44   15  to the right of   12
45   15  to the right of   11
46   16   to the left of    3
47   17   to the left of    0
48   17   to the left of    5
49   17   to the left of   13