Is there a truck to the right of the person on the left?
No, there are trains to the right of the person.
    src        edge_attr  dst
0     0  to the right of    3
1     1   to the left of    4
2     1  to the right of    3
3     1  to the right of    2
4     1   to the left of    5
5     2   to the left of    7
6     2   to the left of    1
7     3   to the left of    0
8     3   to the left of    1
9     3   to the left of    6
10    4  to the right of    7
11    4  to the right of    1
12    5  to the right of    7
13    5  to the right of    1
14    6  to the right of    3
15    7   to the left of    4
16    7  to the right of    2
17    7   to the left of    5