This project is currently in the study phase. Data gathering is underway with anticipated completion of environmental and engineering studies in 2013. The design and construction of the project is not yet funded.
Roadway planning to determine potential future corridors and roadway improvements is conducted well in advance of design and construction. Area population growth, future land use, jurisdictional responsibilities and other factors are used to determine the need, feasibility and general location of future roadway improvements. Previous planning studies within the North-South Study Corridor area have already been conducted.
The study stage identifies alternative locations (alignments) and basic characteristics (number of lanes, type of traffic interchange, etc.) of a roadway. Accompanying this are environmental studies (economic impacts, cultural, hazardous materials, air, invasive species, endangered species, socioeconomics and water), evaluation of the alternatives, general cost estimates, coordination with public and private stakeholders, and the determination of the feasibility project to move to the design phase.
Successful completion of the study processes results in the selection of an alternative and environmental clearances that allow ADOT to move on to detailed design and construction. Project information is shared and discussed with the public at project milestones, and public input is considered in the evaluation of alternatives.
The design of a roadway involves several stages of detailed engineering and technical review and various levels of approval. Project information is shared and discussed with the public at project milestones and public input is considered in the evaluation of design alternatives, as well as during final design. The final design of the roadway is represented in plans and specifications that construction contractors use to prepare construction bids.
Road construction is based on detailed plans and specifications provided to the contractor following the approved design. ADOT continually looks for ways to improve the construction process for maximum efficiency and minimal community impact. Once built, a roadway may be improved over time as a result of future studies.
Construction timing is dependent upon the outcome of the planning and design studies, as well as available funding.
ADOT continually plans for enhancements to the roadway once it is built and in use for maximum efficiency and safety. Various studies identify these enhancements and may influence additional planning, design and construction.