(1) Allowances and travelling expenses sufficient to meet the person's reasonable expenses of complying with the subpoena must be paid to the person at:
(a) the time of service of the subpoena; or
(b) some other reasonable time before the person named is required to comply with it.
(2) The allowances or travelling expenses may be paid by giving
a voucher in substitution for the whole or part of those allowances and
travelling expenses.