New Jersey’s gas tax will go down by 8.3 cents a gallon, or about 16%. on Oct. 1.

Gov. Phil Murphy’s administration announced the decrease Tuesday. It’s the first time in his tenure that the gas tax is going down.

The tax rate will go from 50.7 cents a gallon to 42.4.

The annual evaluation of the gas tax comes as part of a 2016 law that required state funding to support bridge and road infrastructure at $2 billion annually for eight years. The law calls for yearly adjustments to the fuel tax if receipts don’t meet that level.