Riverhead police are warning motorists to avoid Sound Avenue and Reeves Avenue tonight as drifting snow and black ice are combining to make for treacherous conditions.
Police said Sound Avenue east of Horton Avenue to Roanoke Avenue is closed.
Reeves Avenue as well as any roads adjacent to open fields are subject to drifting snow and travel is not recommended, police said.
The best routes for those who must drive are state or county roads, police said. Town highway crews are responding to the worst roads, police said.
Motorists are advised to use caution and reduce speed if out driving tonight.