The Maryland Transportation Authority is exploring phasing out all cash toll booths across the state. Today, tolls are collected three ways: by cash, or electronically, by either an E-ZPass transponder or by video tolling — when the state uses a license-plate photo and mails drivers their bill. Transportation officials say that the transition to all-electronic, high-speed toll collection will: save drivers time on their commute, save the state money, reduce accidents at toll plazas, and reduce CO2 emissions as less fuel is being burned, according to a national study by the University of Central Florida. Drivers in Maryland could start...