If you are in a car with THREE OR MORE motorists, you can ride in the Express Lane for free. If not, you can choose to ride in it for a toll. You can change the "toll mode" on your Peach Pass to avoid getting charged while carpooling, but you have to do it at least 15 minutes in advance - which could be tricky, or rather costly, if you forget.

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What will the toll be?

Here is the most complex part of the whole thing. The toll will change, varying between 10 cents and 90 cents per mile depending on the amount of traffic and other factors, such as the number of vehicles in the Express Lanes and the general lanes, volume capacity in those lanes, the overall speed...

Frequently asked questions about I-85 Express Lanes | 11alive.com