They were up early this morning, before the bike rush hour, to clear the bike lanes of snow.
While it is cool that we have snowploughs for our bike lanes, it's also important to remember that there are so many bikes that if the bike lanes weren't cleared, many people wouldn't ride. That would result in a massive shift of people from the bike lanes onto busses and trains, not to mention cars.
Imagine, wherever you're living, that all of a sudden tens of thousands of extra people [those would normally be on their bikes] suddenly appeared at busstops and train stations one morning. wanting to get on board. It would be chaos.
So the snowploughs are a necessity. They keep the city running because they let the people get to work on their bikes.
On this stretch, in the photo, there are 10,000 bikes per day, on average. That's a medium sized artery for bike traffic.