You need to answer several important questions to narrow down your options of portable traffic lights. Below are some critical questions that will help you to select the best portable traffic lights to buy. How Complex Is The Needed Traffic Phasing? Consider the locations where you intend to use the portable traffic lights. How complex do you expect the phasing of the traffic to be? For example, the portable traffic lights that will work to direct traffic from three different directions may not need to be as complex as the portable traffic lights that are intended to phase the traffic that is moving in six directions.