Replacement of more than 678 traffic signal lamps on state routes in Boyle County and Danville will begin Monday.
The incandescent lamps will be replaced with light emitting diodes. These LEDs are more energy efficient, brighter and last longer than the incandescent ones. The LEDs are a series of tiny light bulbs that work on an electrical circuit.
The work will take about six minutes per signal to complete, according to Signal Power and Light Inc. in Danville, the contractor.
Signals in high traffic areas will be switched in off-peak times.
The upgrade is part of the state Transportation Cabinet's plan to save energy and maintenance costs.