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