Every single overpass will have to be torn down for I-77. The only way the Tyvola interchange would survive is if they only decide to add just two lanes to the project. As it stands, the NCDOT wants to add four, two on each side, and very likely auxiliary lanes as well. I believe this project will be one of the most expensive projects ever taken on by the NCDOT. The road essentially has to be rebuilt, along with ROW acquisition. I'm also wondering if the toll lanes will link with certain interchanges, like the I-485 one.