What are the vehicles that are to the right of the people in the middle?
The vehicles are buses.
    src        edge_attr  dst
0     3  to the right of    4
1     3   to the left of   11
2     3   to the left of   14
3     3   to the left of   12
4     3  to the right of    5
5     4   to the left of   14
6     4   to the left of    3
7     4   to the left of    5
8     4  to the right of    7
9     5  to the right of    7
10    5  to the right of    4
11    5   to the left of   12
12    5   to the left of   14
13    5   to the left of    3
14    7   to the left of    5
15    7   to the left of    4
16   11  to the right of   12
17   11   to the left of   13
18   11  to the right of   14
19   11  to the right of    3
20   12   to the left of   11
21   12   to the left of   13
22   12  to the right of    5
23   12  to the right of    3
24   12  to the right of   14
25   13  to the right of   12
26   13  to the right of   11
27   13  to the right of   14
28   14   to the left of   12
29   14  to the right of    3
30   14   to the left of   13
31   14   to the left of   11
32   14  to the right of    4
33   14  to the right of    5