My brother-in-law saw this design on YouTube (hat tip to Doug the architect) and wants to do it at his driveway entry. I sketched it up in Sketchup to work out the details.

The lazy-K bracing is more interesting than plain old diags or Xs.

Scale of things is for a 12' width roadway through it. 6x6 anchor posts stick up 4' out of the ground, and are about 16 feet between. Hardware is from HooverFence.com.

Up on the 3D Warehouse now. Search for FARM GATE and you will find.

6x6 SYP posts, 2 each x 8 feet, and about 90 bf of western red cedar for the gate leaves. Hardware from HooverFence.com will run about $150, and all the bolts and screws (galvanized or preferred SS) could run another $50.