U.S. highway safety officials are trying to design a new test to replicate the conditions that caused the failure of Firestone tires and create a better early-warning system to prevent future problems, The Washington Post reported in its Saturday edition. Government test standards have not been updated in three decades and requirements for companies to report problems are so weak that U.S. regulators were caught off guard when 6.5 million Firestone tires had to be recalled, the newspaper said.