Life - Cycle Graphical Representation of Managed Hov Lane Evolution

High-occupancy vehicle (HOV) lanes usually go through an evolution of stages in their life cycle. The typical evolution includes changes in demand levels from several modes including 2+ or 3+ carpools and vanpools, transit, and general-purpose vehicles. To ensure adequate usage, most facilities have started out with a designation of HOV 2+. In some cases, over time, HOV2 volumes have exceeded capacity of the facility, which has caused delays for transit vehicles. Therefore, there is an inevitable need for managing the hierarchy of facility users over time. This paper presents a graphical tool that illustrates the lifespan of a managed HOV lane, and it can be applied to a variety of existing and planned managed HOV lane projects. The graphic has previously been used in Colorado in communicating the managed lane concept to transportation professionals. Further, the graphic can be used to explain the historical operation of a managed HOV lane facility and the likely progression if current management policies remain in effect, based upon the experiences of similar facilities. Alternative management strategies can also be evaluated and compared with the graphical tool. The graphical representation of the managed HOV lane concept presented in this paper is anticipated to be valuable for transportation professionals in many areas (e.g., highway, tolling, and transit) in presenting and understanding operating scenarios for managed lanes over time and how they meet the goals of the facility. Finally, the paper presents applications of the life-cycle graphic to various facilities in the United States. TRB 2003 Annual Meeting CD-ROM Paper revised from original submittal.