Making it hard for people to get dangerous things is an important part of suicide prevention. Making it hard for people to get dangerous items can lead to less suicides. Putting up fences at bridges and cliffs reduces suicides. Putting up signs or increasing patrols is not so helpful One example of making dangerous items less available is coal gas in the United Kingdom. Until the 1950s, the most common way of committing suicide in the UK was poisoning by inhaling coal gas. In 1958, natural gas was used instead. Natural gas is much less dangerous. So less people committed suicide.