Legally,can I put spikes on fence/wall?

Using barbed/razor wire and broken glass in order to stop people getting in to your home is not advisable. You are making yourself liable to civil action as you owe a duty of care to ensure that visitors to your property are reasonably safe. As absurd as it may seem you also owe a lower duty of care to trespassers.

The use of such a preventative measure could also be seen as being detrimental to the neighbourhood.

Using other methods of crime prevention such as trellis fencing and defensible planting is often more effective and pleasant to look at.

Trellis fencing is effective because it increases the height of the boundary and it is not usually strong enough to hold an intruder's weight Therefore, they may not want to risk climbing over it, breaking it and making a loud noise. it is important to ensure that you have planning permission, if required, and you do not leave yourself open to civil proceedings. if you are still not sure contact your local crime prevention/reduction officer.

Wall Spikes

What happens to the passengers when they hit a spike strip going 150mph? You'll end up with grated passengers and shredded flight attendants all over your runway. Not to mention shredding the tires DEFINITELY eliminating any braking capability an airplane might have, turning a potential emergency into a guaranteed catastrophe. There is already a perfectly good system in place made of foamed concrete that breaks under pressure from aircraft and slows the plane down very quickly.

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The aircraft section has a lot of jerks in it, as you are clearly seeing. Your question is legitimate, but as others are pointing out, would not work. Here's why: Spike strips work on cars running from police because it takes away two things: traction and control. When a crook is running from the cops, good tracking allows him to accelerate and drive quickly. Control lets him keep the car on the road. The spike strips remove traction and control, which in turn leads the crook to drive slower in order to maintain control. Also, since the wheels lose traction, they can't accelerate the vehicles thus slowing it down. In the case of airplanes, since spike strips don't actually "slow" the airplane down, losing the tires will do little to help an airplane that is having braking troubles. Instead, the spike strips will blow the tires, and at speeds that may exceed 3 times that of a car on the freeway, the rubber will shear away quickly. The remaining metal rim will leave little directional control, little stopping power, and lots of sparks. The loss of directional control may lead to the airplane leaving the runway. The loss of stopping (braking) power sort of negates the whole point. The sparks may lead to a fire. A solution that has been proposed, and is readily available, is something like soft pavement. Basically, it acts like thick mud on sneakers. As someone's foot sinks into the mud, it slows them down. Well, this soft pavement will hold a car's weight, but the heavier airplane wheels will sink into it, and drastically slow the plane down. This soft pavement would be found at the very ends of the runway, so that a runaway plane that is about to run out of runway will encounter this soft pavement and dig in. It is something that has been tested, and currently used at some US airports. Unfortunately, the "stupidity and laziness" of people is true here: although not spike strips, the technology does exist to save run-away airplanes but the high cost leads airport managers to not use the technology.

Under the Occupiers' Liability Acts you owe a duty to visitors to your property to keep them safe. This even applies to trespassers.

As far as trespassers are concerned you would probably escape liability if you had clearly visible notices informing them of the danger and that you accept no liability. However it might be difficult or impossible to actually put these notices on the outside of the fence where they would need to be.

Even with signs you could be liable in some instances. Eg if a policeman had to get into your garden to prevent a serious crime or rescue someone, you would be liable for his injuries regardless.

It is also possible that spikes and/or signs would require planning permission - depending on the rules in force in your local area.

Screwfix Direct sell plastic reinforced spikes for installing on walls to help protect your property,no doubt they will give details of how /where to install. think they have to be fitted to a wall 6feet high ,and no you should not get into any trouble as they are seen and any criminals are therefor forewarned

Yes you can,providing the wall is over 6foot high, when fitting razor wire you must display a sign to that effect.I have broken glass on the top of my wall, cemented in of course

You must put a ladder under your wall on the outside to make it easy for burglars to gain entry. Leave a flask of hot tea on the kitchen table and open the back door before you go to bed. A map of the house indicating the whereabouts of your most valuable items is helpful and not to waste their time, please say if you haven't got anything worth stealing.

ps Leave dog biscuiys in case he/she has a dog at home.

in the uk that would be a definite no. by all means run it past the local council but you will find its a no on domestic property, because it may cause injury to would be burglars, and they in turn can prosecute you. that also goes for glass in cement and razor wire.