现存的联邦铁路局轨道安全标准十分全面，对高达200英里/小时（约合322公里/小时）的速度指定了FRA 1～9类这9种类型的轨道几何形状和欠高。

Existing FRA tracksafety standards are comprehensive and specify track geometry and cant deficiency for FRA Classes 1 through 9 at speeds up to 200 mph.

youdao

分析了公路几何设计与交通安全的关系，提出了公路几何设计中应该注意的安全问题及相关措施。

This paper analyzes the relationship between highway geometric design and traffic safety, and points out matters needing attention in design for safety and corresponding measures.

youdao

从而获得了滑移面几何控制参数与内部稳定性安全系数之间的函数关系。

Then the function relations among the geometrical controlling parameters of sliding surface and the internal stability safety factor are deduced.

youdao