Is the fence to the left of the bus high or low?
The fence is high.
     src       edge_attr  dst
0      0  to the left of   20
1      0  to the left of    6
2      0  to the left of    5
3      0  to the left of    2
4      1  to the left of    8
..   ...             ...  ...
111   28  to the left of   24
112   28  to the left of    3
113   28  to the left of   25
114   28  to the left of    1
115   29  to the left of   21

[116 rows x 3 columns]