Developing highway geometric design guidelines for the 21st century

公路工程师很早就认识到公路系统由三个主要组成部分组成：道路使用者、车辆和道路本身，包括周围环境和环境状况。公路系统的适当设计不仅需要了解这三个组成部分，还需要了解这些组成部分如何相互作用。然而，公路设计实践大多是基于50多年前制定的指导方针。这些准则几乎没有注意到公路系统三个组成部分之间的相互作用。因此，公路设计实践在很大程度上跟不上车辆设计的演变和道路使用者的行为。尽管包括加拿大在内的不同国家的设计指南已经引入了许多改进，但世界各地的高速公路从业者一致认为，仍需要更多改进。

Highway engineers have long recognized that the highway system consists of three main components: the road user, the vehicle, and the road itself including the surrounding environment and environmental conditions. A proper design of the highway system requires not only understanding these three components but also understanding how these components interact together. Yet, highway design practices are based on guidelines that were mostly developed over fifty years ago. These guidelines paid little attention to the interaction among the three components of the highway system. As a result, highway design practices have in large part failed to keep up with the evolution of vehicle design and behaviour of road users. Although many improvements have been introduced in the design guidelines of the different countries, including Canada, highway practitioners worldwide agree that more is still needed.