A driverless Luas system is not possible with current technology, according to Transport Infrastructure Ireland.
In a response to a query from Dublin City Council's Transport Committee, TII says that Unattended Train Operation systems are used in a number of European countries, including France and Denmark.
TII Director of Capital Programme Management Peter Walsh says, however, that this is only possible with a segregated rail track, usually travelling underground.
Mr Walsh says self-driving software is not compatible with the Luas.
He said, however, that this is being considered as part of the design for the planned Metro North system.