NORTH TEXAS (CBSDFW.COM) – Get ready to dig a little deeper when you drive on a North Texas toll road. The North Texas Tollway Authority is instituting a toll rate increase on July 1.

NTTA officials say the increase of .8 cents (less than one cent per mile) is to relieve congestion, maintain quality roads and keep the keep the NTTA “financially viable”.

The NTTA follows a schedule that requires toll rates be increased every other July. The price jump will increases rates from 14.5 cents per mile to 15.3 cents per mile.

The increase is even bigger for ZipCash customers, who pay 50 percent more than TollTag customers.

The NTTA serves Collin, Dallas, Denton and Tarrant counties and oversee roadways including the Dallas North Tollway, President George Bush Turnpike and Sam Rayburn Tollway.