Bright ball light, shape changing to triangular with red light at the point

As I was leaving St. John, Washington on the Pine City-Malden road I crested a hill and spotted a bright white light and continued to glance at it as I could on the way to Rosalia. I stopped at one point when I had a good spot to observe the object and took a couple of pictures with my phone and a little Sony camera. The object seemed to remain stationary and would change shape from round to worm shape to triangular with a red light at the long end. I was working driving a box truck. This is rolling hills wheat country so the road follows the shallow valleys and crests hills. I was soon heading away from the object in a northerly direction and it was behind me. This is the second time I've seen such a light. No fog, high clouds.