Oklahoma City-based Sonic Drive-In plans to open 14 new drive-ins in the greater-Seattle area. The company will open the new restaurants with a new franchise partner, Cascade Development Group LLC. It is anticipated that the first drive-in will open fall of 2014 and the remaining locations by 2018, joining the five existing Sonic locations in the Seattle market. The new Seattle locations are part of the company’s larger growth strategy to push beyond its core markets in the Central United States in areas, including California, New York and Washington. Currently, Sonic operates more than 3,500 drive-ins across the United States.