The main purpose of this legislation is to prevent connected vehicles from entering the United States if they are associated with certain foreign countries deemed as adversaries. The goal is to protect national security by minimizing risks related to data security and potential manipulation of these vehicles. Key provisions of the law include a prohibition on the entry of connected vehicles from specific countries, which include North Korea, China, Russia, and Iran. A connected vehicle is defined as one that uses onboard networked technology to communicate with other networks or devices.