Pennsylvania Turnpike officials are looking into eliminating cash tolls and collecting all of them electronically. The Turnpike Commission is advertising for a consultant to study the matter. More than 62 percent of the users have E-ZPass, an electronic system that deducts tolls from their accounts as they pass through the booths. Others would be billed by mail based on pictures toll booth cameras take of their license plates. Turnpike officials say the all-electronic tolls, which are at least a couple of years off, would eliminate backups at toll booths by allowing all vehicles to move through the lanes without stopping.