How headlights became so high-tech

Since the invention of automobiles, headlights have changed dramatically. Aside from standard illumination, their abilities have expanded with the development of adaptive beams, signal projections and LED matrices. The advancements haven't been completely smooth sailing, however, as the newer tech must be approved by government entities such as the NHTSA and IIHS. So much progress has been made thus far, but how much further can headlight technology go?