Reflective signs are legal in most US states as long as the following restrictions are followed:
- The sign must be mounted horizontally or at a 45-degree angle to the ground.
- It cannot obstruct vehicular visibility.
- A reflectorized area of not more than 3 square feet (0.3 m2) can be included on each side of the sign.
- No advertising, commercial messages, or solicitations may be displayed on the sign.