Vienna Convention on Road Traffic

Cyclists' right to the road has also been enshrined in international law since 1968, with the accession of the Vienna Convention on Road Traffic.

The basic traffic rules are defined by an international treaty under the authority of the United Nations, the 1968 'Vienna Convention on Road Traffic'.

The Convention on Road Traffic signed in Vienna in 1968, commonly known as the 'Vienna Convention on Road Traffic'

The allocation of codes is maintained by the United Nations as the Distinguishing Signs of Vehicles in International Traffic, being authorized by the UN's Geneva Convention on Road Traffic (1949) and Vienna Convention on Road Traffic (1968).