It seems like it has really become worse in the last 5-10 years. If a problem driver is young I think cell phone distraction or booze and drugs, if they are old I think they are completely gakked out on their rx medication.
Freegards
I bicycle commuted in the Seattle area for almost 20 years. I stopped because of cell phone use and texting. It’s always 2:00 Saturday morning out there. That is not a good time to be riding a bike on the roads.
I consider texting to be more dangerous than drunk driving.