If you want to prevent unauthorized access to your property, and you already have fencing, or are planning to install fencing, your next consideration should be a security gate.
But choosing the right gate can be tricky.
Here are a few things you'll want to consider:

• The gate width.
  This may seem silly, and inconsequential, but the width of the gate can have a bearing on the price, and other factors.
  A wider gate will be more expensive in itself, as well as heavier, meaning your choice of motor may be affected.
  Then again, consider things like what kind of vehicles will be entering your property.
  I've heard stories of gates blocking the entry of fire trucks, because they were too narrow - not a good idea!
• Next, consider what type of gate you want.
  Sliding gates are great, but if there is a slope on either side of your driveway or entrance, they can work out expensive, as you'll need to "build up" the soil either side.
  Then again, remember that you will need a distance equal to the gate's width on the opening side, in order to accommodate the gate! If there are trees, objects or buildings, a swing gate may be a better choice.
  
• When it comes to cost, there's probably no bigger factor than material.
  Wooden gates are usually cheaper than steel, especially if you decide to go for a galvanized, coated or painted steel version, but they can be lower maintenance, as timber will need painting or varnishing over time.
  
• Don't skimp on the details.
  Things like sliding wheels, hinges and other accessories should be robust and good quality, since they will be supporting your gate.
  There's no use having a big, fancy sliding or swing gate that doesn't slide or swing, is there?
• Motors are another issue.
  It's tempting to buy the cheapest you can find, but if it's not designed to handle the weight, and number of openings and closings your gate has to deal with, it won't last long.
  If your gate will be working often, consider buying a light industrial motor, instead of one designed for domestic use.
  
• Another thing to bear in mind is that even the best gates and motors need to be maintained.
  One of the most common causes of sliding gate motors not working right is that the track gets clogged with sand.
  This causes the gate to "stick" or even come off its rails.
  A good idea, with sliding gates at least, is to fit one of the brushes on the market, that sweep the track as the gate opens and closes, saving you the hassle of cleaning the track!

A great gate should give you years of trouble free service, but making smart choices when considering this investment can make all the difference.
Do some research, find out what best meets your needs, and then buy the best you can afford, and you should be fine.