What's in front of the van?
The car is in front of the van.
     src        edge_attr  dst
0      0   to the left of    6
1      0   to the left of    4
2      0   to the left of   19
3      0   to the left of   13
4      0   to the left of   23
..   ...              ...  ...
133   22  to the right of    8
134   23  to the right of    0
135   23  to the right of   19
136   23   to the left of    9
137   23   to the left of    8

[138 rows x 3 columns]