In a perfect world, the electronic tolling infrastructure in the United States would be Mastercard seamless: Any transponder would get you through any toll plaza, debiting your account as you breeze across bridges and through tunnels with interstate abandon. But you can't. You should be able to though: In 2012 Congress passed a law requiring the nation's various electronic tolling authorities to come together and make their systems interoperable by October 2016.

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