The Pennsylvania Turnpike is moving ahead with plans to become a completely cashless toll system by fall 2021.

Toll booths will still exist at some exit ramps until 2026 to record E-ZPass signals or photograph license plates, so bills can be sent to drivers. It will allow the turnpike to finish installing 43 overhead gantries in three phases over the next six years.

The $129 million project would eliminate the jobs of 600 remaining toll collectors and toll auditors. Officials said they would be able to move into other turnpike jobs or take classes at its expenses.