COLUMBIA, S.C. — The South Carolina Supreme Court is questioning how a county is spending transportation tax money.

The court said Wednesday the state revenue department did not have the authority to withhold payments to Richland County.

But the justices also said the revenue department’s request for an injunction preventing the county from spending the money should have been approved.

The Supreme Court said a lower court judge should require the county to establish safeguards to make sure the money is spent only on transportation-related projects and some administrative costs.

The high court said the lower court judge could also order the county to repay any previous improper spending.

A county spokeswoman said the ruling is being reviewed by its attorneys.

The tax is to raise more than $1 billion over 20 years.