This International Standard covers high-level safety requirements applicable to automatedurban guided transport systems, with driverless or unattended self-propelled trains, operatingon an exclusive guideway.This standard only deals with the safety requirements needed to compensate for the absenceof a driver or attendant staff who would otherwise be responsible for some or all of trainoperation functions (see Table 1), depending on the level of automation of the system (seeshaded areas in Table 1 and see 3.1 for a definition of the different grades of automation).The requirements of this standard are restricted to transports systems as defined in Clause 5an