These traffic cone signs add additional warnings and directions to create a safer work environment. They have been shown by the Federal Highway Administration to improve safety and reduce liability. Specially cut groves allow the signs to install in seconds and lock firmly in place. The signs are made of all weather UV resistant construction and maintain their high-visibility color. In addition to use on traffic cones, these durable, reusable signs can also be used on traffic barrels and traffic delineators.