Washington, Nov. 1 (Jiji Press)--The administration of U.S. President Donald Trump imposed an additional 25 pct tariff on imports of medium and heavy trucks Saturday, raising the levy on such vehicles from Japan to 50 pct. The new tariff is imposed on top of the existing 25 pct tariff on imports from Japan, as medium and heavy trucks were not included in the Japan-U.S. tariff negotiations. ...