(60)Technological developments and innovations in alternatively-fuelled vehicles, affecting vehicle mass, continue to influence the regulatory framework governing driving licences. Given that that framework is technically complex, it should evolve in a manner that ensures legal certainty and adheres to the principle of technological neutrality, ensuring that rules neither unjustifiably favour nor disadvantage specific technologies, but instead provide a fair and future-proof framework. Therefore, the Commission should monitor technological progress in alternatively-fuelled vehicles, and assess its impact on staging and equivalences between driving licence categories, to ensure a clear, balanced and up-to-date regulatory framework that safeguards road safety without stifling innovation.