What are the current regulations and implementation plans for e-toll systems in the USA?

As of now, the regulations and implementation plans for e-toll systems in the USA vary by state. Each state has its own system in place, with some using interoperable systems that allow for seamless travel across state lines. The Federal Highway Administration has been working to promote interoperability among different systems to make travel more convenient for drivers. It is recommended to check with the specific state's Department of Transportation for the most up-to-date information on e-toll regulations and implementation plans.