快速道路（或快速公路）是专供高速度交通工具使用、双向之间有分车带之公路（Divided highway）。与高速公路同样都是提供汽车使用，但服务等级较高速公路为低，如设有平面路口等一般道路的设计。部份国家不用「高速公路」（英语：Freeway），而采用「快速道路」（英语：Expressway）作为其境内汽车专用道路的名称。

A limited-access road, known by various terms worldwide, including limited-access highway, dual-carriageway, expressway, and partial controlled access highway is a highway or arterial road for high-speed traffic which has many or most characteristics of a controlled-access highway (freeway or motorway), including limited or no access to adjacent property, some degree of separation of opposing traffic flow, use of grade separated interchanges to some extent, prohibition of some modes of transport such as bicycles or horses and very few or no intersecting cross-streets. The degree of isolation from local traffic allowed varies between countries and regions. The precise definition of these terms varies by jurisdiction.