Cars that drive themselves starting to chat with each other

An Acura RLX sedan demonstrated an unusual way to tow another car this week: the vehicles were not physically attached. The second car drove itself, following instructions beamed over by the first in a feat of technology that indicates a new stage in automation is happening faster than many expected.

Systems that enable vehicles to communicate with each other have been developed in recent years in parallel with features that enable cars to drive themselves. Manufacturers and suppliers now are putting the two together in novel ways, with broad implications for vehicle safety and convenience.