144.455.  Tax on motor vehicles and trailers, purpose of — receipts credited as constitutionally required. — The tax imposed by subdivision (9) of subsection 1 of section 144.020 on the titling of motor vehicles and trailers is levied for the purpose of providing revenue to be used by this state to defray in whole or in part the cost of constructing, widening, reconstructing, maintaining, resurfacing and repairing the public highways, roads and streets of this state, and the cost and expenses incurred in the administration and enforcement of subdivision (9) of subsection 1 of section 144.020 and sections 144.440 to 144.455, and for no other purpose whatsoever, and all revenue collected or received by the director of revenue from the tax imposed by subdivision (9) of subsection 1 of section 144.020 on motor vehicles and trailers shall be promptly deposited as dictated by Article IV, Section 30(b) of the Constitution of Missouri.