Interstate 21, often abbreviated as I-21, is a proposed highway in the United States that aims to connect various regions across the country. The route is intended to enhance transportation efficiency and improve access to major cities and economic centers. The proposed interstate would link with existing highways, such as Interstate 95 and Interstate 40, facilitating smoother travel for both commercial and personal vehicles. While the project is still in the planning stages, it has the potential to significantly impact regional development and connectivity.