Nissan Motor Co. is not necessarily tied to the idea of investing in General Motors Corp., said Nissan Cochairman Itaru Koeda, referring to ongoing talks on a possible three-way alliance between Nissan, General Motors and Renault S.A.

"A capital tieup is one option, but there are many cases that go well without shares being held," Koeda said.

Meanwhile, sources said the same day that Nissan has decided to develop a car that won't start unless the driver is sober as the nation seeks a crackdown on drunk driving.