How important traffic light is

what is a traffic light? is the traffic light important? why at every crossroads made traffic lights? what might happen if we do not obey the traffic rules?
Traffic lights are lights installed at each intersection to keep traffic safe and orderly, reducing road accidents.
If we use a vehicle on the highway then it is important to obey the rules of traffic lights otherwise it will happen a very fatal accident that can take our soul or others. So be careful and please obey the traffic lights if you don't want to get fatal problem caused of your careless...