A large truck can't stop and maneuver as quickly as a vehicle. I'm not a truck driver, but I've seen some awful driving by regular drivers when they interact with trucks on the highway. Many of the drivers (cars) have little or no defensive driving skills. They put themselves, the truck driver (a professional) and others around them in danger.

To be honest, if the snowfall was predicted to be that bad, people should've been ordered to stay off the roads due to extreme conditions. It's not good enough for a Premier to suggest the emergency services weren't up to par.