SAN FRANCISCO

Fiat Chrysler is joining the self-driving alliance led by BMW Group, Intel Corp and its Mobileye subsidiary, becoming the second automaker in the year-old group to opt to partner in developing an autonomous driving platform.

More automakers are seeking alliances to share the high costs of developing self-driving vehicle technology, which requires extensive research and development and software expertise outside the traditional domain of carmakers.

The group plans to put its technology for both fully and partially autonomous driving into production by 2021, matching a general time frame shared by rival automakers and technology companies who are developing such technology alone.