So I guess I'll never know what the deal was with highway 85 northbound between San Jose and Palo Alto this morning after 10.
Summary: hop in car with boss in San Jose and head up 85 toward a meeting. After a while, encounter very slow traffic. Eventually emerge, noting a tow truck dragging one car away. Soon arrive at another very slow patch. Eventually emerge, seeing no cause for it. Approaching 280 offramp, note that 85 is about to stop yet again. Fortunately, we were taking the 280 exit.
Oh, and there was almost a fourth traffic blockage: cruising along, a minute or so before the first cluster of brake lights came into view, I suddenly found the left half of a pickup truck in my lane, half a car-length ahead of my position. As in, the back left quarter of the truck was trying to be in the same space where I was. Fortunately, there was a vacant space in the next lane to the left.