Products... Electronic traffic control devices Arrow Boards Solar powered portable arrow board. Perfect for traffic direction wherever needed. Portable Traffic Signals Ideal for bridge or road construction projects where traffic must be reduced to a single lane. Eliminates the need for flaggers 24/7. Traffic sensors and loop detectors reduce traffic wait times. Ideal for haul roads to safely allow trucks to enter the roadway. Portable Changeable Message Signs (Message Boards, Variable Message Signs) Portable programmable message boards, great for use in work zones or for advertisement.