What physical constant ensured that chains remained a necessary item even as road surfaces improved significantly through the 1920s?

Answer

The fundamental physics of driving on ice and deep snow remained unchanged.

Despite advancements in road construction, the physical properties of natural ice and deep snow surfaces persisted, meaning that tire chains remained essential safety equipment for those specific extreme conditions.

What physical constant ensured that chains remained a necessary item even as road surfaces improved significantly through the 1920s?
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