While driving east on highway 50 from sacramento to folsom in northern california, i witnessed an abnormal horizontal line/trail in the sky that seemed to tunnel through a very wide range of cloud formations. in the middle of the cloud formations was a much more dense cloud formation that i would imagine was forming at or beyond the highest peaks of the sierra nevada's, which was many miles in the distance from where i was at. as i kept driving, i noticed that the line/trail began to disappear in a manner that didn't coincide with how long the trail was. the entire trail seemed to disappear at the same time, unlike an airplane trail which dissipates evenly over time. also, on one side of the trail it seemed to stop and double back in a parallel manner to the dense cloud formation in the middle. i continued to drive and watched the trail dissipate to nothing other than what seemed to be a few thicker streaks in the middle of the dense cloud formation. i then decided to take a picture of those thick streaks in the middle, as traffic had slowed down quite a bit. when taking this pic, i did not suspect that what i was looking at was a ufo, but when i was able to zoom in on the pic indoors i saw what seemed to be perfect geometry of an outer rim and a shadow underneath. as you will see, the primarily anomaly is obscured by the cloud formation. there is also a smaller anomaly that you can barely see underneath the primary anomaly. based upon my location and the size of the anomaly in the distance, it was an extremely large phenomenon whatever it was.