Md. cautions drivers on bridges, overpasses

With darkness falling, bridges, overpasses and off-ramps are too dangerous to drive on, said Charlie Gischlar of the Maryland State Highway Administration, even though the state is laying down salt.

"It's coming down at such a clip that as soon as we make a pass it's just piling up again," Gischlar said.

He says they are using snow blowers, in addition to plows, because by now many highway shoulders are packed with plowed snow.

"We're trying to keep at least a couple of lanes open. Then, when we can, we'll come in with front-end loaders to clear the shoulders."

--Ashley Halsey III