Toyota Motor Corp. and Nippon Telegraph and Telephone Corp. said Thursday they will join hands to develop artificial intelligence-supported driving software aimed at reducing vehicle accidents. Japan’s auto and telecommunications giants, which formed a capital alliance to build energy-efficient “smart cities” in 2020, plan to invest a combined 500 billion yen ($3.3 billion) in the project. Research and development of the software will be launched next year. The two companies seek to put the software into practical use around 2028, with widespread adoption anticipated for two years later. The A…