Is the truck to the left or to the right of the vehicle that the passenger is on?
The truck is to the right of the bus.
    src        edge_attr  dst
0     0  to the right of   18
1     1  to the right of   19
2     1  to the right of   20
3     1  to the right of   15
4     2        parked in    5
5     2  to the right of    3
6     2  to the right of   17
7     2  to the right of   18
8     2   to the left of    8
9     3   to the left of    2
10    3   to the left of    8
11    4   to the left of    7
12    7  to the right of   12
13    7  to the right of    4
14    7               in    6
15    8  to the right of    2
16    8  to the right of   17
17    8  to the right of    3
18    8  to the right of   18
19    9   to the left of   15
20    9   to the left of   10
21    9   to the left of   19
22   10  to the right of    9
23   10   to the left of   19
24   10   to the left of   15
25   12   to the left of    7
26   12               in    6
27   12               in    4
28   14  to the right of   16
29   14               on   18
30   15  to the right of   10
31   15  to the right of    9
32   15   to the left of   19
33   15   to the left of   20
34   15   to the left of    1
35   16               on   18
36   16   to the left of   14
37   17   to the left of    2
38   17   to the left of    8
39   18   to the left of    8
40   18   to the left of    2
41   18   to the left of    0
42   19  to the right of   15
43   19  to the right of   10
44   19  to the right of    9
45   19   to the left of    1
46   19   to the left of   20
47   20  to the right of   15
48   20   to the left of    1
49   20  to the right of   19