Yellow signifies WARNING. Yellow traffic signs stand for slowing down, driving with caution, or a general warning. It may be yellow, or yellow-green with black wording or symbols. This sign warns you about hazards or possible hazards on or near the roadway. A yellow traffic light is a warning that a red light is soon to follow. You have two options as you approach a yellow light. In most cases, yellow lights mean “slow down,” not “speed up.” But if you're already practically in the intersection, don't slam on your brakes as that could cause an accident. It was around the 20th century when yellow began to be valued for its high visibility. It can be seen well from afar and even from fast-moving vehicles, making it the ideal colour for road safety signs. Yellow signals warning or caution and is used in signs worldwide to prevent accidents.
The Big Three: Regulatory, Warning, and Guide/Marker Signs
Most warning signs are yellow and diamond-shaped with black letters or symbols. Some common warning signs are shown on the next slides. This sign warns you that the road ends ahead. Slow down and prepare to safely turn left or right.