Thanks. I've seen them in several places that get only moderate snow (a category in which I might include DC), but other than Leipzig, not in a very snowy city. NYC wall street has something similar, but it is really different, manned infrastructure.
We're concerned about plowing and maintenance, especially salt.
They use a form of them on the Mid-Hudson Bridge in Poughkeepsie, NY -- definitely a snowy city. The bridge is 3 lane so they actually get moved daily to switch the direction of the center lane.
I'd recommend against them in all weather for purely personal reasons. I had a truck clip one and it flipped up, coming straight down into my windshield. It does some damage, let me tell you! (Thank God I kept it together mid-way over the Hudson River and didn't crash!!) I don't think they're worth the risk.