Power Line Works In Progress (T4-5)The Power Line Works In Progress (T4 5) traffic control sign is designed to alert motorists and pedestrians of active power line maintenance or construction near the roadway. Manufactured with super bright traffic yellow CL400 Class 1W reflective material, it ensures excellent visibility both day and night, prompting drivers to reduce speed and exercise caution around high voltage work zones. This sign is available in 900 x 600 mm size, and is fully