Metro launches limited-edition Smart Trip card for DC’s Grand Prix

The Washington Metropolitan Area Transit Authority is off to the races — and putting speed in riders’ pockets with a limited-edition Smart Trip card for Washington, D.C.’s Grand Prix. The race is part of Freedom 250 to commemorate America’s 250th anniversary.  The IndyCar race will take place from Aug. 22 to 23, transforming D.C. streets…