This paper describes the geometric assessment study currently used in Alberta. Current approaches to geometric rehabilitation works are identified and their limitations are discussed. Influencing factors which include: (1) design standards, (2) design process, (3) programming, and (4) data collection are also discussed. Rationalization of geometric improvements based on cost-effectiveness priciples is illustrated. The geometric assessment process incorporates functional, operational and geometric parameters in the analysis. It is apparent that strict application of current geometric design standards for upgrading of existing paved roads is often not cost-effective. Besides geometric considerations, system classification, collision history and level-of-service factors must also be examined to arrive at the best decisions for 3R/4R projects. Use of the geometric assessment process will assist highway planners and designers in scoping for cost-effective geometric improvements for 3R/4R projects. Moreover, the geometric assessment study is a proactive mitigative measure to minimize future tort claims against highway agencies.
Abstract