Winter approved tires should have the 3PMSF symbol on the sidewall of the tire indicating that they have passed the tests required for winter approval. Winter commercial tires should be used for all types of buses and trucks driving on major roads.
Even within agriculture they will need to ensure that they can run their tractors safely in winter conditions. The tractors can also be used for snow removal if they have proper tires that can withstand winter conditions. Snow removal is important tasks and often a well paid contracting work, as there is a high demand for it once the snow falls.