What vehicles are on the road below the street light?
The vehicles are cars.
    src        edge_attr  dst
0     1               on   20
1     1               by    4
2     2               on    8
3     3               on    4
4     3  to the right of   18
..  ...              ...  ...
66   20  to the right of   16
67   20  to the right of    9
68   20   to the left of    7
69   21   to the left of   10
70   21               by    4

[71 rows x 3 columns]