The second type is exact-change lanes. In these lanes, motorists deposit coins in a toll basket and each coin is mechanically counted. Payment of tolls is enforced by photo, a system that went into effect on October 17, 2011. The Union Toll Plaza was the first to use an automated toll-collection machine; a plaque commemorating this event includes the first quarter collected at its toll booths. Historically, these lanes also accepted tokens, and were common on main roadway toll plazas. However, between September and October 2018, exact-change lanes were discontinued on mainline toll plazas; they continue to be used for exit and entrance ramp toll plazas.