What are the customers to the left of the guy doing?
The customers are waiting.
     src        edge_attr  dst
0      0  to the right of   30
1      0   to the left of   10
2      0   to the left of    8
3      0  to the right of   14
4      0  to the right of   11
..   ...              ...  ...
296   30   to the left of   14
297   30   to the left of   20
298   30   to the left of   19
299   30   to the left of   22
300   30   to the left of   23

[301 rows x 3 columns]