(a) If an operator or owner is required to pay for registration of additional weight under Section 621.406 in a county other than the county in which the owner resides, the assessor-collector of the county in which the payment is made shall send the amount collected to the department for deposit to the credit of the state highway fund.
(b) The department shall send the county's share of the amount collected under Section 621.406 to the county in which the owner resides.