NJ commuters will have to be careful this morning, even after salt and sand crews pre-treated roads overnight in anticipation of more black ice.

Townsquare meteorologist Dan Zarrow warns that conditions are "not quite as slick and dangerous as yesterday, but the black ice this morning will still offer a nasty surprise if you're not ready for it"

Dan Alexander/Townsquare Media

New Jersey Fast Traffic's Bob Williams reports that speeds were reduced to 45 MPH on the New Jersey Turnpike from the Delaware Memorial Bridge to exit  #7A (I-195) in Mercer County and to 50 MPH for most of the Garden State Parkway due to conditions. Speeds were also reduced on the Commodore Barry and Betsy Ross brides crossing the Delaware River.

There were a couple of other incidents tying up traffic this morning. Route 22 eastbound was closed in Union at the Parkway due to icing and flooding under the Garden State Parkway overpass. There was also an accident on Interstate 80 in Paterson involving a flipped over box truck, although it is not known if that incident is weather-related.

While most school districts were closed for the Martin Luther King Day holiday, several North Jersey districts holding class reported delayed openings to New Jersey Stormwatch.

The NJ Department of Transportation warned commuters to be especially careful of icing on overpasses and bridge as those surfaces will freeze first.

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