Are there either any white trucks or buses?
No, there is a truck but it is blue.
    src        edge_attr  dst
0     0   to the left of    5
1     0  to the right of    4
2     1   to the left of    4
3     2   to the left of   10
4     2   to the left of    6
5     2   to the left of   11
6     4   to the left of    0
7     4  to the right of    1
8     4   to the left of    5
9     5  to the right of    4
10    5  to the right of    0
11    6  to the right of    2
12    6  to the right of   10
13    8  to the right of   11
14    8  to the right of   10
15   10   to the left of    6
16   10  to the right of    2
17   10   to the left of   11
18   10   to the left of    8
19   11  to the right of    2
20   11  to the right of   10
21   11   to the left of    8