I say bring back the way we did the bike course back 35 - 40 years ago

You get 10 motorcycle riders from the local bike club.

They have a person on the back

They wrote down the number of anyone drafting

At the end of the race anyone who had their number written down 2 times or more received a 5 minute penalty

It was difficult to find anyone actually drafting because there were motorcycles all over the course