Physics

本文分析雨騎情境下的速度決策，以安全邊際為判準，依據視距、路面污染、煞車過彎需求與操控回饋建立未校準的漸進降速框架，並在文中設定的雨勢、路況與騎乘者條件下優先選擇降低配速。

Rain riding changes the speed decision from pursuing efficiency to preserving control. With wet pavement, changing visibility, surface contamination, braking and cornering demands, there is no calibrated rule for a fixed speed reduction or stopping distance. This article compares maintaining dry-road pace with reducing pace under the same conditions, then offers a four-dimensional framework built around visibility, contamination, braking and cornering demands, and handling feedback. The bounded recommendation is to reduce pace progressively when the priority is retaining observable room to adjust.