Temperatures rose to 40 degrees or more in many areas of the Garden State on Wednesday.
Transportation Department spokesman Joe Dee said roughly 400 salt spreaders remained in use Wednesday afternoon. Crews also were clearing snow from stormwater drains in areas where water was ponding on roadways.
Most travel and speed restrictions were lifted by noon. But authorities were still urging motorists to use caution because of slush and standing water on the roads.
State police warned that falling temperatures would create icy conditions overnight, causing more problems for drivers on Thursday.
Thursday's high was not expected to top 30 degrees in most places.