What is the name of the vehicle in front of the sign that is on top of the pole?
The vehicle is a car.
    src        edge_attr  dst
0     0           behind    2
1     0        on top of    7
2     1           behind    3
3     1             near    3
4     2  to the right of    4
5     2      in front of    0
6     3             near    6
7     3             near    1
8     3      in front of    1
9     4   to the left of    2
10    4  to the right of    7
11    4   to the left of    5
12    5  to the right of    4
13    5             near    8
14    6             near    3
15    6  to the right of   11
16    7   to the left of    4
17    7  to the right of   11
18    8             near    5
19    9        on top of    8
20   10               on    7
21   11   to the left of    6
22   11   to the left of    7