Think more like it being a motorcycle... there is no crash protection at all there, and people still safely drive them. The difference is what you rely on for safety. With a car, most people mindlessly stay in their lane and when rely on airbags, crumple zones, etc to keep them safe when involved in a accident. Motorcyclists must be more aware of their surroundings and actively avoid dangers to stay safe. An alert motorcyclist can avoid the accident altogether.
That's another reason to lose a wheel... trikes are generally considered motorcycles and thus are allowed special exemptions in most (all?) states, such as being allowed to drive in HOV lanes. I would think a trike could handle snow equally well as compared to a 4-wheeled car with more weight per tire.
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