A double swing gate (sometimes 'double-leaf' or 'biparting') splits the opening into two leaves that meet at a centre stile. Each leaf hinges to its own post. One leaf usually carries a drop bolt that engages a ground sleeve to lock that leaf shut, and the second leaf latches against it.
Double swings suit residential driveways from 3.0 m up to about 6.0 m. They side-step the long lever-arm problem of a single 6 m swing leaf, which would need oversized hinges and very deep posts to stay plumb. Centre meeting stiles are usually overlapped or rebated to seal against draft and intrusion.
CAD60's double swing models split the opening symmetrically and produce one drawing pack with both leaves dimensioned plus the meeting-stile detail.