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Some tables make little/no difference to cycle speed, but there's no indication yet of how the tables will look. I think cycling might ironically benefit from the low clearance of some RP residents' cars.
I see the point you're making about other cycling venues - but the circuits at least, aren't necessarily (1) free (2) always open to public (3) convenient (4) any better for not being passed by a chain gang (+corners).
Of course, if RP is changed for the worse, there's no other option and we will have to make do.
I haven't seen the full plans/proposals/consultation draft etc. but this is the raised tables plan (credit to the FB group).