《轨道安全标准》（《联邦法典》第14卷第213部分）根据最大容许速度，就九个等级的铁轨明确了要求。
The Track Safety Standards (49 CFR Part 213) specify requirements for nine classes of track based on maximum allowable speed.
计算表明，电视塔上塔楼的加速度响应大大超出了容许的最大加速度限值。
It is found that the acceleration response of the upper turret of the tower is much larger than the allowable acceleration of human comfort.
计算表明，电视塔上塔楼的加速度响应大大超出了容许的最大加速度限值。
It is found that the acceleration response of the upper turret of the tower is much larger than the allowable acceleration of human comfort.
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