Japanese automaker Nissan (NSANY) finds itself at a crossroads. Nissan was poised to participate in a megamerger with rival Honda (HMC), and it was a huge development when the talks were revealed late last year.

TOKYO — Nissan is set to call off merger talks with rival Honda, a source said Wednesday, abandoning a $60 billion-plus tie-up that would have created the world's No. 3 automaker and raising questions about how it will drive a turnaround by itself.

There's strife of the horizon as Nissan vehemently opposes Honda's suggestion of making the struggling carmaker its subsidiary.