Our oldest son, and some of his family, drove out from Texas about 10-days or so ago, via the Palm Springs area and eventually ending up in Monterey, CA to visit their oldest daughter and family. They then stopped and spent a couple days with us and then stopped again in the desert to visit our daughter-in-law's sister. They then left on Thursday arriving back in Katy, TX, late, this past Friday evening.
They've driven this same round trip from Texas, perhaps not the Monterey portion, but at least the Irvine, via Palm Springs, route many times over the years.
Our son said that on the way out here he noticed that truck traffic was a bit less but not really that noticeable if you didn't stop and think about it. However, on their way back to Texas this past Thursday and Friday, he said it was like night and day. He had never seen the roads so empty of big rigs. He said it was almost eerie, like some scene from an apocalyptic movie. What really got his attention was that they had driven that same route, at least between Katy and Palm Springs, only a week ago and in that time, things had totally changed.

OCU