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4.弯道。道路的弯度用道路中心线的曲率半径来表示。曲率半径越小,弯道越急,行车越危险。当曲率半径小于50m时,称为急弯。
Bend The curvature of the road is represented by the radius of curvature of the road centerline. The smaller the radius of curvature, the more acute the curve, the more dangerous the driving. When the radius of curvature is less than 50m, called the sharp bend.