There was a time when the most frustrating thing about summer road trips were the lines at the toll booth.
Remember digging through the seats for exact change or scrambling to find the shortest line? Toll collection has come a long way, from handing money to cashiers to simply driving through the booth with an E-ZPass.
But the technology passed through many, often surprising, hands — musicians and spies and NASA scientists — to become the electronic toll booths many highways enjoy today.
'Music Out Of Thin Air'