What vehicle is blue?
The vehicle is a bus.
    src        edge_attr  dst
0     0  to the right of    2
1     0  to the right of    1
2     0  to the right of    9
3     1  to the right of    9
4     1   to the left of    0
5     2   to the left of    0
6     2  to the right of    7
7     2  to the right of    4
8     2  to the right of    8
9     4   to the left of    6
10    4   to the left of    5
11    4  to the right of    8
12    4   to the left of    2
13    5  to the right of    4
14    5  to the right of    7
15    6  to the right of    4
16    7   to the left of    5
17    7   to the left of    2
18    8   to the left of    4
19    8   to the left of    2
20    8   walking across    7
21    9   to the left of    0
22    9   to the left of    1