I've said it before, I'll probably say it again many times: people just cannot drive in the goddamn rain. I have no idea what incites mass panic the minute a few water droplets fall from the sky, but you'd think in a place like the Seattle area where rain is frequent that people would have a handle on this phenomenon. WRONG.
I go to work in the afternoon to avoid all the morons on the road during rush-hour traffic, and I've learned that checking out the WSDOT website and their traffic maps are an invaluable tool to avoid traffic jams. Usually things clear up and are somewhat moderate with a smidgen of heavy here and there around 6PM (THU and FRI being the exception where traffic can suck past 7PM.) Anyway, as usual I am monitoring traffic conditions before I leave, and sure enough the route I take to get home is heavy to stop and go the whole way. One quick glance outside my office window explains why. It's raining.
And if you think that's bad, you should see what happens when it snows an inch or two... (which happens about once a year.)