Is there a bus on the road?
No, there is a car on the road.
    src        edge_attr  dst
0     1               of    8
1     1   to the left of    8
2     2  to the right of    9
3     2               by    7
4     4  to the right of    9
5     5   to the left of   11
6     5  to the right of   13
7     6               of    9
8     6  to the right of   10
9     8   to the left of   12
10    8               on    7
11    8  to the right of    1
12    9               on    7
13    9   to the left of    4
14    9   to the left of    2
15   10   to the left of    6
16   11  to the right of    5
17   12  to the right of    8
18   12  to the right of   14
19   12               on    7
20   13   to the left of    5
21   14               of    9
22   14   to the left of   12