Which kind of vehicle is on the road?
The vehicle is a bus.
    src        edge_attr  dst
0     0             near    3
1     0   to the left of    1
2     0             near    1
3     1          next to    0
4     1             near    2
5     1           beside    2
6     1               on    4
7     1  to the right of    0
8     1          next to    2
9     2             near    1
10    2               on    4
11    2          next to    1
12    3             near    0