Unfortunately, like many of the other traffic control devices, it is often misused, causing motorist confusion or surprise and injuries to workers, pedestrians, or motorists. Another serious problem is when motorists see it incorrectly used. They may not understand its meaning and later disregard the message when used properly. Virginia DOT maintenance crew driving slowly on major urban arterial in right lane with arrow flashing to the right directing motorists to pass to the right over the curb. The arrow should have been flashing to the left on this 4-lane road.
Arrow continues to flash and direct traffic to the right.
Worker loads sign as arrow continues to flash to the right. Changeable message signs are coming into vogue in work zones. More study is needed on effective messages and their use. The Type I barricade has a bag of sand on the top for stability. Sand bags can penetrate the windshield of an impacting car and cause injury or death.