November ushers in the rainy season in San Francisco. Inclement weather starts to be a major problem in many parts of the U.S. this time of year. While extreme weather conditions (think hurricanes and tornadoes) inspire headlines, car accidents caused by bad weather kill many more people per year across the country. According to the U.S. Department of Transportation, roughly 22 percent of all vehicle crashes involve hazardous weather. That translates to nearly 6,000 deaths per year in accidents caused by rain, fog, snow, ice and other weather phenomena.