MONTPELIER, Vt. — Vermont’s transportation agency has spent more than $30 million keeping highways plowed and maintained this winter, despite budgeting less than $20 million.

WCAX-TV reports that the Agency of Transportation budgeted $18.5 million for winter maintenance this season. So far, it has spent $31.7 million. Last winter, it spent $36.9 million.

Road salt usage has gone up. This year the state used more than 133,000 tons, surpassing a record set in the winter of 2015-2016. Officials say freezing rain early in the season required more salt and sand.

The transportation agency maintains state highways and interstates. Towns are responsible for salting and plowing local roads.

Information from: WCAX-TV,