Amends the Illinois Vehicle Code. Exempts from the prohibition of the use of green oscillating, flashing, or rotating lights on motor vehicles or equipment any motor vehicle or equipment owned by the State, the Illinois State Toll Highway Authority, local authorities, and contractors when the lights on those vehicles or equipment are used in combination with amber or amber and white oscillating, flashing, or rotating lights, but only when such vehicles or equipment are engaged in maintenance or construction operations within the limits of construction projects. Effective immediately.