If your gates are to be automated, automation contractors are normally involved. Oftentimes your general contractor understands the process and can manage this himself. And on occasion the resourceful homeowner. Automation itself is fairly complicated. Not just selecting the correct motors and their installation, but trenching power to the site as well as understanding all the options regarding communicating with the house–call boxes, remotes, keypads, overrides, etc.
It should be noted that the Driveway Gates represent by far the most complicated installation of any of our products. If there are masonry columns involved, this more or less insures that a general contractor is on site, scheduling the column construction, the automation needs, as well as installing the actual gates.
Drive Gate Specifications page is worth reading. It has pictures!–for those of you in Turkey or Bombay looking for the same answers as those in the States.