WASHINGTON, Sept 21 (Reuters) - The U.S. Commerce Department is expected on Monday to propose prohibiting Chinese software and hardware in connected and autonomous vehicles on American roads due to national security concerns, two sources told Reuters.

The Biden administration has raised serious concerns about the collection of data by Chinese companies on U.S. drivers and infrastructure as well as the potential foreign manipulation of vehicles connected to the internet and navigation systems.

The proposed regulation would ban the import and sale of vehicles from China with key communications or automated driving system software or hardware, said the two sources, who declined to be identified because the decision had not been publicly disclosed.

The move is a significant escalation in the United States' ongoing restrictions on Chinese vehicles, software and components. Last week, the Biden administration locked in steep tariff hikes on Chinese imports, including a 100% duty on electric vehicles as well as new hikes on EV batteries and key minerals.