Georgia officials have formalized a toll policy as they prepare to open 40 miles of new express lanes this year.

The State Road and Tollway Authority, which operates the lanes, recently set a minimum toll of 10 cents a mile on all Georgia express lanes. That’s in keeping with what’s already happening on the existing express lanes on I-85 lanes in Gwinnett County and I-75 lanes in Clayton and Henry counties.

SRTA also set a minimum toll of 50 cents per trip during period of very low demand, regardless of the length of the trip.

SRTA Executive Director Chris Tomlinson said the uniform policy was “for the ease of customer use and a consistent customer experience on Georgia express lanes.”

The move comes as Georgia prepares to open the 30-mile Northwest Corridor Express Lanes on I-75 and I-575 in Cobb and Cherokee counties. Those lanes were set to open at the end of August, but the collapse of a wall earlier this summer has uncovered a wider problem with retaining walls along the corridor. Now the opening date is uncertain.

The state also expects to open a 10-mile extension of the I-85 lanes in Gwinnett by the end of the year.