This document constitutes the 3rd edition of CEN/TS 16794-1. It sets out the technical requirements tobe met by contactless Public Transport (PT) devices in order to be able to interface together using theISO/IEC 14443 series (ISO/IEC 14443-1, ISO/IEC 14443-2, ISO/IEC 14443-3 and ISO/IEC 14443-4)contactless communications protocol.