(*when the sun comes out in Seattle after a long rain (which can go on for months in the Winter), the roads can become almost as hazardous as they do in San Diego after the first rain)

LOL!!! Almost true. I would have said "almost as hazardous as they do in San Diegeo during the first rain". Californians don't understand rain well and don't usually drive well when it starts to come down. But after the first hour, they start to recover their senses. :-)