The study team developed high-level, regional alternatives that were more abstract in nature. This allowed the study team to evaluate the wider transportation system as a whole. The screening process for the Regional Alternatives included evaluating alternatives based on their ability to meet the following project purposes:
• Improve regional and local mobility
• Provide enhanced system linkage between I-15 and I-84 on US-89
• Improve safety
The project purpose to address current and future travel demand on US-89 is evaluated in Secondary Purpose and Need Screening in the US-89 System Alternatives section.
The study team developed high-level, regional alternatives to evaluate the wider transportation system as a whole. The study team developed the following regional alternatives:
• No-action Alternative
• US-89 Six-Lane Arterial Alternative
• US-89 Four-Lane Freeway Alternative
• US-89 Six-Lane Freeway Alternative
Additionally, the study team evaluated other concepts recommended by the public. These concepts included a connection from I-84 to I-15, increased transit, widening I-15, reduced speed on a four-lane US-89 freeway, combining concepts with the US-89 Six-Lane Arterial Alternative, and combining concepts with the US-89 Four-Lane Freeway Alternative.
The study is also evaluating various cross street alternatives. These represent various ways to provide access to and from US-89 from local roads in and around the corridor. Grade-separated interchanges are being proposed at 200/400 North, Oak Hills Drive, Gordon Avenue, and Antelope Drive. Overpasses are being proposed at Nicholls Road and Crestwood Drive.