This is fairly standard across Disneys parks. One turnstyle is used for Character Meal Entries. The other turnstyles will have lines of general guests lining up waiting for park open. If it's hard to see the signs over the turnstyles just ask a CM which line to go to. The "line" usually is non existent because those people are going right in. Could be a little tricky since the DCA entry is under constrauction.