Unlike tramway electrification, the wires were hung using massive wire gantries and steel masts. Instead, cameras mounted onto new overhead gantries collect the tolls. There are two mainline SunPass gantries (Anderson and Sugarwood) and six ramp plazas. Additionally the OBUs have infrared interfaces for communicating with stationary control gantries on the motorways. This interchange has toll gantries on the southbound exit and northbound entrance. Overhead gantries between most exits read E-ZPass transponders. Instead, there are cameras mounted onto new overhead gantries near where the booths were located. Instead, there will be cameras mounted onto new overhead gantries. The marshaling yard and empty yard was provided with rubber tyred gantries. Instead, there are cameras mounted onto new overhead gantries located on the Staten Island side. They are generally mounted on poles or gantries or hung from wires. A six pylon system replaced the old gantries in 1963. Mainline toll gantries are planned to begin operation by 2022. Vehicles passing both sets of gantries are charged the full toll. The scheme consists of ERP gantries located at all roads linking into Singapore's Central Area.