The term designates a controlled-access highway designed for high-speed vehicular traffic flow. These roadways eliminate at-grade intersections, traffic signals, and pedestrian crossings, fostering an uninterrupted journey for motorists. Examples include Interstate highways in the United States and similar high-speed roads worldwide.
This nomenclature reflects a core design principle: the unimpeded flow of vehicles. The absence of tolls on many of these roads in the past further reinforced this idea. The objective is to provide a rapid and efficient method of traversing substantial distances, minimizing delays and enhancing overall transportation network performance. Historically, early implementations emphasized cost-free access, although this is not universally maintained today.
