Do you see a bus on the road?
No, there is a car on the road.
    src        edge_attr  dst
0     0   on the side of    5
1     1               by    5
2     1   to the left of    3
3     1  to the right of    2
4     1  to the right of    7
5     2   to the left of    4
6     2               on    5
7     2   to the left of    1
8     3  to the right of    1
9     3  to the right of    7
10    3   on the side of    5
11    4               on    5
12    4  to the right of    2
13    6               on    5
14    7   to the left of    3
15    7   to the left of    1