Emergency braking required by 2022DETROIT — Automakers, safety regulators and consumer groups have agreed to require automatic emergency braking in new vehicles by 2022, according to several people who were briefed on the matter.Mark Rosekind, administrator of the National Highway Traffic Safety Administration, will make the announcement Thursday at a highway research center in McLean, Va., the sources said.The automated system is already available in many models. It is an example of how semi-autonomous features can improve safety by enhancing a vehicle’s ability to avoid collisions.The technology integrates cameras, radar and other sensors to detect objects and pedestrians in the path of a car even if the driver can’t see it.