So apparently when 80 was rebuilt a few years ago there was a bit of a fuckup. As in, they used concrete, instead of asphalt, the stuff that is used everywhere else. So after a couple years of cars and trucks with chains driving on it, it is literally polished smooth. Pretty much guaranteed that there will be wrecks when it is wet, even during summer rainstorms, usually in the same spots. I believe CalTrans and CHP have even acknowledged this, though not sure if there are any plans to actually fix it.