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.
Learner's permit Typically, a driver operating with a learner's permit must be accompanied by an adult licensed driver who is at least 21 years of age or older and in the passenger seat of the vehicle at all times.[23]
Stop sign A stop sign is a traffic sign to notify drivers that they must make sure no cars are coming and stop before proceeding.[1]
Torque converter Some of these devices are also equipped with a "lockup" mechanism which rigidly binds the engine to the transmission when their speeds are nearly equal, to avoid slippage and a resulting loss of efficiency.
Bull riding The flank strap
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.