Are there any trucks or trains that are not blue?
No, there is a truck but it is blue.
    src        edge_attr  dst
0     0  to the right of   11
1     0   to the left of    8
2     0  to the right of   14
3     0  to the right of   13
4     0  to the right of    7
5     0   to the left of    9
6     1  to the right of    3
7     1   to the left of    9
8     2   to the left of    4
9     3   to the left of    1
10    3   to the left of    4
11    3   to the left of    7
12    4  to the right of    3
13    4  to the right of    2
14    6   to the left of   12
15    7   to the left of    0
16    7  to the right of   13
17    7  to the right of    3
18    8  to the right of    0
19    8  to the right of    9
20    9  to the right of    0
21    9   to the left of    8
22    9  to the right of    1
23   11               on    7
24   11   to the left of    0
25   11  to the right of   13
26   12  to the right of    6
27   13               on    7
28   13   to the left of   11
29   13   to the left of    0
30   13   to the left of    7
31   14               on    7
32   14               on    2
33   14   to the left of    0