By Tony Romeo

HARRISBURG, Pa. (CBS) — Another round of annual toll hikes is set to take effect along the Pennsylvania Turnpike on Sunday.

The Pennsylvania Turnpike used to impose bigger toll hikes several years apart, but after state lawmakers enacted a new transportation funding scheme in 2007, the turnpike began enacting smaller toll increases on an annual basis.

Since 2011, the turnpike has been imposing bigger toll hikes for cash customers than EZ-Pass users.

As of Sunday, tolls for EZ-Pass customers will go up about 2%, while motorists paying cash will pay about 10% more.

The cumulative effect of the toll differential now means EZ-Pass customers pay around 25% less than motorists paying cash.