To use the lanes, motorists must have a Peach Pass— a sticker that attaches to your car and records tolls as motorists pass checkpoints. The toll varies along with traffic congestion: the worse the traffic, the higher the toll. The idea is to raise the price to discourage some people from using the lanes, ensuring that traffic moves along at 45 mph or more.

That's been a challenge on the I-85 lanes, which are often congested at rush hour. That's why the State Road and Tollway Authority recently eliminated the maximum toll of $13.95 on the lanes. Since then, the price for the longest trip has reached as high as $15.95.

For most of the day, the minimum toll on all express lanes is 10 cents a mile (there’s a flat 50-cent-per-trip toll overnight).

About 30,000 people use the existing I-85 lanes each weekday.