Reminds me of the time witnessed such a crash. I was passing a public bus while riding in the bike lane (at the time that was the sidewalk (with nice wide grassy median between the road and the sidewalk), on one side of the road only. Ashland, Oregon, circa 1986). I was young, oncoming, and fast (nice tailwind, downhill leg), when I see the bus stop to pick up/drop off some passengers at SOSC's (now SOU's) Student Union, and suddenly hear the familiar sound of screeching tires and rending metal.

Turns out that the driver of the VW Bug was following a little too close, and didn't see the bus stop because of the glare of the rising sun on wet pavement directly ahead of him. Fortunately, for me, a cop was behind them and he witnessed the crash too, so I didn't need to leave any details. No serious injuries.

I'm actually surprised that it doesn't happen more often, as Siskiyou Blvd. runs directly East/West. and Ashland is known for getting nice patches of black ice in the winter.