PRT systems therefore more closely replicate the operation of the private car. The Seattle Monorail has such a drive system. Some systems run on induction motors. Vehicles roll on rubber wheels before levitation is achieved. Elevated systems now operating range from those under total human control to those that are fully automated.
Vehicles have no human operators on board.
The system can be overridden by the operators in the control center. The BART system in San Francisco has a single operator on board each train who serves as a backup safety measure. Financing The Monorail initiative suggests that private funds are available to build the system and that revenues needed to compensate private investors and operate the system can be realized from rents collected from commercial operations at station locations, and from parking fees and other transportation services. The ETC is given authority to build revenue-producing improvements associated with the system. Traditionally, public works projects often place all of the financial risk incurred in their construction on the taxpayer.