The portable traffic signal features a tower with a traffic signal attached to it. The signal itself is typically going to be on a base that features wheels. The lights are still heavy, so you will have to be careful when you are moving it from place to place. Some of the units also have a solar panel attached to them so they can gather solar energy for their power. They will also have a control system that you will be able to use to program the lights, or to use a preset program.