Stop
red
if your colour-blind then I can not answer that but if your not stop being stupid.
Red is universally recognised as meaning danger - hence it means stop. Yellow usually represents a warning - in signals - it means 'be prepared to act' Green is accepted as the colour to mean everything is fine. The colours may have had specific meanings but have probably been lost over time.
Tail markers and stop lights must be red. Turn signals can be red or amber.
No, you legally should NOT move until the flashers stop and if there is a stop sign on the bus that it has been retracted. It doesn't matter if a bus driver flags you to go... or signals you to go. If those flashers are red or orange---keep your foot solidly on the brake. Go when the flashers and stop-sign end, AND you can see no other dangers, like a kid in the roadway.
RED!
The color red generally tells you "stop" or "don't." For example, stop signs are red, and a red circle and slash means that the thing pictured on the sign is prohibited. Red is universally regarded as a "warning" colour - DANGER!
There are three types of traffic lights viz., red ,yellow,green. While red signals dead stop,the yellow signals slow movement and green signals free movement.The traffic signals are shown by green arrows,depicting movement of traffic like,right hand,left hand or straight forward.
red-stop yellow-slow down green-go
Red - has always meant danger, Green has always meant good. Amber is used to 'prepare' a driver either to stop or go.
because human eye is sensitive to yellow and green, it has become a tradition to use red as a signal for caution also red colour has largest longest wavelength