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What is the maximum speed limit for a heavy motor vehicle towing a semi-trailer or semitrailers?
重型机动车牵引一辆或多辆半挂车时，最高限速是多少？
A heavy truck towing a semi-trailer has a maximum speed limit of 90 km/h, subject to any lower posted limit.
重型卡车牵引半挂车的最高限速为每小时90公里，并须服从更低的道路限速。
阅读相关知识
Visibility, weather, road conditions, load or permit conditions may require a lower speed. The maximum is not a target for every situation.
视距、天气、路况、载重或许可条件可能要求更慢；不能将90公里当作所有情形都可达到的速度。