What vehicle is on the street?
The vehicle is a truck.
    src        edge_attr  dst
0     0   to the left of    2
1     1   to the left of    6
2     2  to the right of    3
3     2   to the left of    6
4     2  to the right of    0
5     3               on    0
6     3   to the left of    2
7     4            above    8
8     5               on    8
9     5        on top of    8
10    5   to the left of    7
11    5   to the left of    6
12    6  to the right of    1
13    6  to the right of    5
14    6  to the right of    2
15    6        on top of    8
16    7  to the right of    5
17    8            under    4