Nassau and Suffolk police are reporting dozens of car crashes and numerous spinouts.
Snow, slush and ice from the storm created a triple threat for drivers.
One SUV wound up upside down on Motor Parkway in Central Islip. Another car slammed into a pole on Jericho Turnpike near the Woodbury-Syosset border.
Some drivers say they are surprised by the number of dangerous drivers out.
"I've seen a couple people slide off the road," said Bob Carton, of Syosset. "People cut people off. People going through red lights. It's just nuts out there. "