Shoot, it better be. Holes are 4' deep, well below frost line and I undercut the concrete driveway too. These are big, heavy, round tube, cattle style gates with each one being 8' long.
In the future, I might install an motorized gate opener, so these posts really had to be sturdy, plumb and straight. The whole concept is to keep the dogs in and the riff-raff out. It's a decent nieghborhood but every now and again the occaisonal dirtbag will be seen walking/driving down the street scoping out access. A few no tresspassing and beware of dogs signs will go up too. A buddy mentioned welding spikes curved outward on the gates but I think that might be a little much..