what is the interstate compact clause

Interstate 40 starts in Barstow, California (an exit off of Interstate 15), and runs all the way across the country to its end in Wilmington, North Carolina.

Interstate highways are identified on signs with a shield-shaped design. This distinctive shield shape makes it easy for drivers to recognize and navigate interstate highways across the United States.

Because the country is going broke and can't afford it.

Interstate compacts are subject to Congress approval. This is set down by the United States Constitution Article 1, Section 10.