do turn signal lights have to be yellow
Automotive lighting The colour of light emitted by vehicle lights is largely standardised by longstanding convention. It was first codified in the 1949 Vienna Convention on Road Traffic and later specified in the 1968 United Nations Convention on Road Traffic.[5][6] With some regional exceptions, lamps facing rearward must emit red light, lamps facing sideward and all turn signals must emit amber light, while lamps facing frontward must emit white or selective yellow light. No other colours are permitted except on emergency vehicles.
Commercial driver's license A commercial driver's license is a driver's license required to operate large or heavy vehicles.
Universal indicator The colours from yellow to red indicate an acidic solution, colours blue to violet indicate bases and green colour indicates that a solution is neutral.
Yellow line (road marking) Double yellow lines mean no waiting at any time, unless there are signs that specifically indicate seasonal restrictions.[10] They were first introduced in the UK by section 51[12] of the Road Traffic Act 1960[13] (repealed in 1972 and replaced by later legislation).