I personally applaud people for slowing down when it's frigid outside... there are way too many idiots around my neck of the woods that never adjust their driving habits to conditions. Seeing that you're in Toronto, you must have just gotten the same reprieve that we did from the -30 weather over the past week. There were hundreds of accidents every day this week here in Ottawa from people driving too fast for the conditions and losing control on the black ice. Even the best snow tires are hard as hockey pucks at -30 and your car will not stop, steer or accelerate anywhere near its normal capabilities. Learn a lesson from these slow drivers, they're more in tune than you appear to be.
The other obvious thing to keep in mind that even in perfect conditions in the middle of summer, the speed limit is a maximum, not a minimum.
