Triangle formation of twinkling lights

I was driving south in interstate 5 (I-5) by Dagmars boat yard south of Marysville when I saw three bright lights in front of the cloud cover in triangle formation. Ii was huge but they were separate craft. By the time I got to Everett they had spread apart further. One was over Snohomish area east of Everett, another was west over Boeing, the third was south west of Everett, it was difficult for me to follow and see these while driving. They were very bright and twinkling cycling red white and blue.  They seemed higher in the sky but they seemed lower the closer I got to them maybe 500 feet in the air at the lowest point.