Method for providing access to one or more transponder functions of a transponder mounted in or on a vehicle, at least one of said one or more transponder functions comprising transmitting a signal comprising a transponder identifier to a receiver of a timing system that is configured to determine the point in time that said transponder passes said receiver , said method comprising: establishing a communication link between said transponder and an access module configured to determine time information comprising an indication of the current time, wherein said access module is implemented as a secure hardware device that is removably connected to the transponder via a wireless Bluetooth, Wi-Fi or near field communication (NFC) interface or a wired data bus , preferably a CAN bus; sending a transponder identifier to said access module ; receiving encrypted rights information from said access module , said rights information being determined on the basis of at least part of said transponder identifier , said rights information comprising one or more access conditions for determining when a user of said transponder has a right to access at least part of said transponder functions; a cryptographic module in said transponder decrypting said encrypted rights information on the basis of a decryption key that is stored in a secure memory of said transponder ; storing said decrypted rights information in said secure memory of said transponder ; determining said rights information stored in said secure memory of said transponder ; receiving time information from said access module ; determining whether said user has a right to access at least part of said one or more transponder functions on the basis of at least part of said access conditions and said time information; and, a microcontroller in said transponder configuring at least part of said one or more transponder functions in accordance with said rights information if said user has a right to access said one or more transponder functions. establishing a communication link between said transponder and an access module configured to determine time information comprising an indication of the current time, wherein said access module is implemented as a secure hardware device that is removably connected to the transponder via a wireless Bluetooth, Wi-Fi or near field communication (NFC) interface or a wired data bus , preferably a CAN bus; sending a transponder identifier to said access module ; receiving encrypted rights information from said access module , said rights information being determined on the basis of at least part of said transponder identifier , said rights information comprising one or more access conditions for determining when a user of said transponder has a right to access at least part of said transponder functions; a cryptographic module in said transponder decrypting said encrypted rights information on the basis of a decryption key that is stored in a secure memory of said transponder ; storing said decrypted rights information in said secure memory of said transponder ; determining said rights information stored in said secure memory of said transponder ; receiving time information from said access module ; determining whether said user has a right to access at least part of said one or more transponder functions on the basis of at least part of said access conditions and said time information; and, a microcontroller in said transponder configuring at least part of said one or more transponder functions in accordance with said rights information if said user has a right to access said one or more transponder functions. <EOS>