In this scenario, the original facility should be well established and evaluated, and there should be an awareness of the current road pricing conditions in terms of effectiveness, acceptance, and an awareness of pricing. Few equity-related problems are being caused by or perceived within the current HOT lane system. For this scenario, expansion can be considered either by extending the length of the facility, expanding the capacity of the existing facility, expanding into a network of priced roadways, or implementing a cordon pricing scheme.
Expansion can be highly rewarding and very effective in dealing with the growing challenges of congestion and a limited ability to expand freeway capacity due to construction costs, right-of-way constraints, and environmental and societal impacts. This scenario is very much related to the concept of "managed lanes," defined as "highway facilities or a set of lanes where operational strategies are proactively implemented and managed in response to changing conditions." In expansion projects, it is important to consider cooperation across agencies and geographical borders as these projects frequently cross jurisdictional boundaries. Careful planning and project development is key to successful implementation. As the system expands, equity may be a larger issue than when only one road was priced. Other equity considerations, such as rural and urban issues, should be addressed as well as the market and societal equity at either end or either side of the project boundaries.
For the purposes of this guidebook, we will think in terms of a city planning to expand tolling along its roadway network as follows: city Y currently accessible from three directions: north, south, and east. The north Interstate currently has an HOT lane while the south Interstate only has general purpose lanes. The east access road is a highway corridor with an adjacent arterial, also un-priced. Due to current budget shortfalls, funding is insufficient to add general purpose lanes to the south Interstate and east highways. Thus, expanding the HOT network to these facilities, utilizing their existing footprints, is now being considered.