The colour of light emitted by vehicle lights is largely standardised by longstanding convention, first codified in the 1949 Vienna Convention on Road Traffic and later specified in the 1968 United Nations Convention on Road Traffic.
The colour of light is largely standardised by longstanding convention. This light is emitted by vehicle lights. The colour of light is largely first codified in the 1949 Vienna Convention on Road Traffic. This light is emitted by vehicle lights. The colour of light is largely later specified in the 1968 United Nations Convention on Road Traffic. This light is emitted by vehicle lights.