race bikes don't have speedos you sre correct
and that is maybe 1 reason why they were always escorted back by traveling marshall
aswell as being kept to sensible pace
what we have to remember this incident wasn't normal as the bike or bikes were traveling wrong way very soon after red flags which has never happened before and the officals car was still on route to original incident

and also spare a thought for the people in that car aswell as steve mercer and and his family and team