Snowy roads are already beginning to cause crashes across Massachusetts and the rest of New England on Monday morning.
Accidents had already been reported on Interstate 93 north in Andover and Route 24 south in West Bridgewater, along with other areas, as of 4:30 a.m.
A jackknifed tractor trailer on the Massachusetts Turnpike west around 4:45 a.m. was also causing major delays
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The rain-snow line is around the Interstate 495 corridor, pushing inland.
Outside of I-495, including Worcester, the conditions are snowy, with snow falling at 1 to 2 inches an hour. Inside I-495 in areas like Boston roads are mostly wet.
But even on rain-covered roads some accidents are being reported, including a 5-car crash on I-93 north in Stoneham.
If you need to travel, now is not the time if you can avoid hitting the roads.
The Massachusetts Department of Transportation has a winter storm travel advisory in effect.
Drivers who must make trips should expect delays, reduce speed, and use caution.
In New Hampshire, highway officials have reduced the maximum travel speed to 45 mph on several major highways, including the Everett Turnpike, Spaulding Turnpike and Interstate 95.
New Hampshire State Police said they had already responded to more than 50 crashes across the state before 9 a.m. One of them, on the Spaulding Turnpike, involved a state police cruiser responding to another accident. The trooper was not in the cruiser at the time and there were no injuries.