In Dubai for those without speed limiters a short session behind a course car running at 60 kph was run. I seem to remember the official explanation was so that drivers could figure out what revs they were running in various gears to achieve that 60 kph.
I'm sure something similar could be worked out. (or nowadays just run with a gps enabled smartphone clamped somewhere.)
Policing by the timekeepers is simple enough - and believe me, when the field is all (more or less) doing 60kph, anybody doing more stands out. A quick call to race control usually gets there times inspected. Treat it like 4wo regards offence and penalties perhaps.
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