The cost of that toll? Depends on your E-ZPass

Some 50 million Americans are expected to hit the roads this year, mostly during the summer tourism season.

The number of toll roads is increasing, and in many states, drivers who bought their transponders elsewhere get charged what’s called the cash rate, a higher amount they’d pay if they had to queue up and hand over bills and coins. Most of the time, drivers don’t even know it — raising questions about government transparency.