Mackinac Bridge to Accept Credit Card Toll Payments, Warily reports that MDOT expects motorists to be able to pay Mackinac Bridge tolls by credit card before the end of this year. However, “We’re still going to encourage customers to use cash or toll cards whenever possible because it is still the fastest option,” a department spokesman tells the site. “One of the concerns we have is the credit card processing times at peak traffic periods could result in backups on the bridge. . . .” During peak hours only one toll lane in each direction will process credit card payments.