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In this situation, the safety distance essentially depends on:
The safety distance that should be maintained from the vehicle in front serves to ensure that, in the event of a sudden stop, the driver can immobilize the vehicle without colliding. In this specific situation, the presence of snow and the consequent reduction in grip on the asphalt significantly increase the braking distance, so the safety distance essentially depends on the road surface conditions.Reaction time is a characteristic of the driver and does not change directly depending on the road condition. Atmospheric conditions influence the environment, but it is the physical state of the road surface (reduced grip due to snow or ice) that directly dictates the necessary increase in safety distance.