222   Payment by instalments

An amount required to be paid to RMS by a roads authority under this Division is payable:

(a)  if the amount exceeds $2,000, by instalments of such amounts, payable over such period, as may be agreed on between RMS and the roads authority, or

(b)  in any other case, within 90 days after demand by RMS or within such further time as RMS allows.