Governor Deval Patrick declared a state of emergency and banned cars from the road this afternoon as Massachusetts braces for apotentially historic blizzard that could blanket the state with more than 2 feet of snow, whip up winds to 70 miles per hour, and batter the coast with giant waves.

Patrick announced the vehicle ban, which will go into effect at 4 p.m., at a news conference at the state’s emergency bunker in Framingham. The state will lift all tolls on the Massachusetts Turnpike as of 2 p.m.