text: Why should people use their phones if they are operating a vehicle? It is dangerous for someone driving a vehicle to use their phones because it can cause an accident. People should not use their phones while driving. People use their phones to text,answer phone calls,and to make plans. You can not do two things at once everybody uses their phones instead of paying attention to the road. You should always drive safe and make sure you stop at every traffic light. You should have drive at the speed limit. No car should ever go 100mph on the interstate or on a busy street. It will be hard to stop your car at a red light if you are going 100 mph. You will most likely get pulled over or get into a car accident if going that fast.