Does the truck to the right of the other truck look gray?
No, the truck is dark.
    src        edge_attr  dst
0     0   to the left of    7
1     0  to the right of    3
2     2  to the right of    7
3     3   to the left of    5
4     3   to the left of    0
5     3   to the left of    8
6     3   to the left of   13
7     4       covered in   15
8     4       covered by   15
9     5   to the left of    6
10    5  to the right of    3
11    5  to the right of   12
12    5  to the right of   13
13    6  to the right of   12
14    6  to the right of   10
15    6  to the right of    5
16    7  to the right of    0
17    7   to the left of    2
18    7  to the right of   12
19    8  to the right of    3
20   10   to the left of    6
21   10  to the right of   12
22   11  to the right of   12
23   12   to the left of   11
24   12   to the left of   10
25   12   to the left of    7
26   12   to the left of    6
27   12   to the left of    5
28   13  to the right of    3
29   13   to the left of    5
30   15         covering    4