Japan plans to agree to let the United States maintain its automobile tariffs for a certain period during preparatory talks for joining the Trans-Pacific Partnership free-trade negotiations, sources said Tuesday.

As the United States fears a possible surge in Japanese auto exports to the U.S. market under the TPP, Japan is set to agree that the United States will be allowed time to eliminate the tariffs in an attempt to extract a U.S. concession over Japan's agricultural tariffs once it enters the TPP negotiations, the sources said.

Japan's participation in the TPP negotiations has been opposed by the U.S. auto industry, as well as by Japanese farming groups fearful of cheaper agricultural imports. Japan currently imposes high tariffs on farm products such as rice and wheat to protect domestic farmers.