[Moupponge]

I can tell you that the amount of snow is not always the biggest factor in terms of accidents. The important factors are how wet/dry the snow is, the road surface temperature, and the timing relative to commuter traffic. Waking up to 8 inches of dry snow can be less much treacherous that 2 inches of wet snow falling onto super-cooled pavement during the drive-time commute when the plows and sanding trucks can't move around effectively. And freezing rain (rain falling onto super-cooled surfaces) usually trumps any snow situation.