Associated Press: A 50 percent increase in gasoline and diesel fuel taxes is being urged by a federal commission to finance highway construction and repair until the government devises another way for motorists to pay for using public roads. The National Commission on Surface Transportation Infrastructure Financing, a 15-member panel created by Congress, is the second group in a year to call for higher fuel taxes. With motorists driving less and buying less fuel, the current 18.4 cents a gallon …