"The traditional classification systems have been based on the mobility and access functions of roads for motor vehicle traffic. Other road users and road uses have been largely ignored in this important step of the road design process. This article describes alternative classification systems..."

Road classification systems are the basis for defining function and, in turn, the design criteria for the world's street networks. The traditional classification systems have been based on the mobility and access functions of roads for motor vehicle traffic. Other road users and road uses have been largely ignored in this important step of the road design process. This article describes alternative classification systems developed by the American Association of Architects, the Province of Ontario, Metro Portland, and the Region of Hamilton-Wentworth.

Roadway design practices are inextricably linked to the purpose of the road as defined by the functional classification system. However, the traditional functional classification system considers the road to be strictly a transportation corridor for motorized vehicles. Streets and roads, particularly in an urban area, are multi-modal transportation corridors and serve more functions than that of mobility and access. Streets are public places: places to gather, socialize, window shop, people watch, etc. An alternative classification system for urban and downtown streets is necessary to better integrate the road, and its design, into the urban fabric. Alternative classification systems that take into account the variety of functions and users of the road allowance have been developed.

Further Reading:

Urban Roadway Classification: Before the Design Begins