Next to overtaking on fast two-lane highways, changing lanes on dual carriageways is the most dangerous maneuver most drivers undertake. It is also one at which autonomous cars are notoriously bad, despite well over a decade spent working on the algorithms. But progress is being made surely, if slowly, which has prompted at least one auto maker, BMW, to take a longer road towards autonomous driving than some of its competitors. It has decided that automatic lane changing will not be perfected anytime soon, and so should focus on getting that right before claiming is vehicles are ready even for SAE Level 3 autonomous driving – where the vehicle must be capable of taking over such safety critical operations under…