A major winter storm dropping snow across northern Arizona created hazardous driving conditions across some major freeways Wednesday.

Arizona Department of Public Safety spokesman Raul Garcia said officers responded to dozens of incidents involving vehicles colliding or sliding along freeways but no fatalities were reported. Most of them occurred near the city of Kingman along Interstate 40 and other highways.

A winter storm warning was in effect until midday Thursday for northern and eastern parts of the state, along with the mountains in the southeastern section.

People hoping to head from the Phoenix area north to Las Vegas for New Year’s Eve were out of luck Wednesday morning. The Arizona Department of Transportation closed northbound traffic lanes on US 93, the highway connecting the two cities, in Wikieup because of poor driving conditions. Southbound lanes were still open, officials said.

Parts of the Flagstaff area had up to 5 inches of snow by midmorning. Forecasts called for accumulations of 9 to 15 inches by late Thursday.