Attention drivers: Watch out for dense fog, black ice

Attention drivers: Watch out for dense fog, black ice »Play Video
Dense fog obscures the top of the U.S. Bancorp Tower in downtown Portland, Ore. Dec. 24, 2013. Drivers can expect dense fog in the region through at least noon Christmas Day.

PORTLAND, Ore. – Fog will be a big concern for drivers over the Christmas holiday.

The low visibility will only be more dangerous in the dark and as temperatures drop, expect some black ice as well.

Bridges, onramps and places at higher elevations are going to be the problem spots Oregon Department of Transportation crews will be focusing on starting Tuesday night.

"You put the deicer on the roads, it lasts a good three or four days as long as we don't get a lot of rain to wash it off the roads," said ODOT spokesman Don Hamilton. "So we're in a good condition right now – good circumstance right now to put some deicer on the roads where it can do some good over the next couple of days without an expectation of a lot of rain to wash it off the roads."

A "dense fog advisory" went into effect 7 p.m. Christmas Eve and will last through at least noon Christmas Day.