London-bound traffic will be able to join the M4 at junction 2 and traffic heading out of London can stay on until junction 2, although there is a lane two closure in this direction.

BBC: M4 closure: Drivers told to stay away

Mr. DAVE FINKELSTEIN (Director of Asian Security Studies, CNA Corporation): One of the hallmarks of this particular report is that it doesn't just stay in what government people would say, the military lane in the road.

NPR: U.S. Notes Growing Chinese Military Strength