A man-made sign is called a signal or symbol. It is an artificial thing, which people decide means something in their society. For example, the stop sign on the road tells the person that they must stop their car there. So does a red traffic light. They are signals with a legal meaning, and people learn what these meanings are.
A road sign or traffic sign is something that gives information by means of a symbol, or in only 1 or 2 words. It helps people in their vehicles on the road. Some signs include: Give way, Stop, Keep left, No U-turn, no parking, Zebra crossing and much more. Signs are very useful. Without signs and traffic lights there would be many accidents and arguments on the road.