Reimbursing Our American Drivers (ROAD) Act of 2008 - Increases to 70 cents per mile, for the period after December 31, 2007, and before January 1, 2009: (1) the standard mileage rate for calculating the tax deduction for business, medical, and moving use of an automobile; and (2) the standard mileage rate for reimbursement of federal employee automobile expenses. Increases from 14 to 40 cents per mile the standard mileage rate for purposes of computing the tax deduction for the use of a passenger automobile for charitable purposes.