[dougedey]

It's because they aren't the best for it. They'd require a lot of passes.

So they modified a zamboni! https://www.youtube.com/watch?v=THe4vZ2dVfM

http://www.macleans.ca/news/canada/smooth-operator-2/

[bhouston]

Ah, another picture:

http://www.vancouversun.com/crews+clear+snow+then+flood+Ride...