Are there either any clocks or cars?
Yes, there is a clock.
     src        edge_attr  dst
0      0  to the right of   22
1      0  to the right of    7
2      0  to the right of    4
3      0  to the right of    2
4      0  to the right of    6
..   ...              ...  ...
124   35  to the right of   21
125   36  to the right of   30
126   36   to the left of    3
127   36  to the right of   21
128   37   to the left of   16

[129 rows x 3 columns]