Ohio constitution
Article XII: finance and taxation
Section 5a

No moneys derived from fees, excises, or license
taxes relating to registration, operation, or use of vehicles
on public highways, or to fuels used for propelling
such vehicles, shall be expended for other than
costs of administering such laws, statutory refunds and
adjustments provided therein, payment of highway obligations,
costs for construction, reconstruction, maintenance
and repair of public highways and bridges and
other statutory highway purposes, expense of state enforcement
of traffic laws, and expenditures authorized
for hospitalization of indigent persons injured in motor
vehicle accidents on the public highways.