Washington State Department of Transportation crews have started to replace the high-pressure-sodium highway lighting with the LED lighting system on US 101 west of Olympia. The installation is expected to be completed by Friday, March 1 followed by full operation of the adaptive system by mid-April.
 
John Nisbet, WSDOT state traffic engineer, said the LED system uses new, state-of-the-art technology known as an “adaptive system.” This will allow WSDOT crews to remotely adjust the light levels and turn individual light poles off when traffic levels are low. These adaptive features have the potential to decrease costs and provide environmental benefits while maintaining adequate lighting levels.
 
WSDOT expects the LED system to last 15 years and the technology with dimming controls will reduce energy usage to the 88 light poles by 1.7 million kilowatt-hours of electricity and save more than $75,000 in maintenance and operating costs, when compared to an HPS system.
 
“Over the next 22 months, we will look at how the lights function and analyze the cost savings at this location,” Nisbet said. “That information will help us build a plan for more LED lights across the state. We have close to 60,000 lights on the state highway system and more LEDs could translate into significant energy and cost savings.”