Toll-collection authorities in 17 states promote electronic payment for road, bridge, and tunnel charges through an interagency co-marketing deal called E-ZPass. The 30-year-old E-ZPass system currently involves 35 million vehicles that use on-board radio frequency transponders to trigger debits from prepaid accounts to make payments. Users drive through dedicated lanes with transponder readers rather than stopping to pay at tollbooths. Prepaid accounts are linked to a consumer’s bank or credit/debit card account and are topped up to $40 after every transaction. A start-up called Verdeva/...