It appears that over the winter the County decided to switch from salting trails to plowing. (I leave near Rt 7 and Walter Reed and ride down the trail along Walter Reed, then down the trail along Four Mile Run to the Mt Vernon trail and then in to DC that way.)
I am surprised by the timeliness of some of the plowing that happened - in particular, the that runs parallel to Walter Reed between Rt 7 and Arlington Mill Drive was plowed recently very quickly after the snow - this makes a lot of sense since if you are going to plow trails (and not salt), it should happen fast before the snow turns into ice from people walking on it.
The different this past week was very noticeable between the trails I use in Arlington and the Mt Vernon Trail, which was untreated and unplowed. The main thing was that the trails that were plowed become clear and useable by a regular bike quickly and the Mt Vernon trail was only rideable until Thursday either by riding very carefully or by having a bike with studded tires (which I have).
Plowing isn't a perfect solution - Tuesday in particular some trails had been plowed before my morning ride but the result was that the asphalt (with the 15 degree weather) was coated with a thin sheet of ice instead of a thicker layer of ice and snow so that a regular bike would not have traction - it would have been impossible to ride without studded tires. But by that afternoon the situation was already better, and Wednesday morning the Arlington trails were rideable (with care) while the Mt Vernon trail was not. Still, I think plowing is better than treating with salt etc.
The plowing is good. Thank you.
Plowed trail near my house - makes a big difference!
This kind of systematic effort to clear trails used by cyclists (and others, of course) following snow storms is new this year in Arlington, and there was enough snowy weather for some experimentation. The first round was to use salt/road treatment type applications on the trails, which isn't great if you want to walk a dog using the trail and also is hard on the bicycle and the surrounding environment since the salt/chemicals aren't confined to the trail (asphalt). Plowing is a lot better, and the County shifted to that, which is great.
Better still would be to have a little less snow.