Yeah, Del Dios can be a bit scary but it is a fun road, especially going down. In the 11 years I have been riding it I have never seen a bike/car accident there.
There are a handful of real highways that allow cyclists as well. Pretty mych every time I do a ride from my house I ride up and over the 52 where cars and Semis regularly ride in the 80s. Thankfully there’s a nice wide shoulder. Whenever a semi blows by in the right lane I get a real nice push from all the wind it generates.