how much does it cost to build a four waystop
1 According to the City of Woodbury, Minnesota website, a complete traffic signal for a standard four-way intersection will cost around $250,000 to $300,000.2  Other expenses like project inspection and design can bring up the cost to almost $300,000. Purchasing a traffic light for personal use can range anywhere from as little as $150 to as much as $500. 2  For instance, TrafficLights.com has a variety of lights that can cost $159 to $379.