There has been a big debate for a long time around the effectiveness of erecting suicide barriers. One of the main examples is the Golden Gate Bridge that sees as many as 40 suicides each year leading to a strong campaign to argue that money should be spent making the jumping sites inaccessible. The argument for them is that focal sites such as these are frequently used and if it is possible to deter the person momentarilty they may not carry through and may even seek counselling. The argument against is that individuals will substitute to different sites. I have been looking for evidence in this area. A number of recent high level reviews were in favour of them.
A recent empirical paper is an example
http://bjp.rcpsych.org/cgi/content/abstract/190/3/266
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The Bridge is a 2006 documentary film by Eric Steel that tells the stories of a handful of individuals who committed suicide at the Golden Gate Bridge in 2004. The film was inspired by an article entitled "Jumpers," written by Tad Friend appearing in The New Yorker magazine in 2003.
The Bridge focuses on the large number of suicides that occur each year at the Golden Gate Bridge, capturing footage of the suicides and interviewing family members. Also interviewed are people who have attempted suicide at the bridge, and witnesses of the suicides.
The movie was shot with multiple cameras pointed at a notorious suicide spot on the bridge during 2004. It captured 19 people as they took their final plunge, and then offers interviews with grieving families.
http://en.wikipedia.org/wiki/The_Bridge_(documentary_film)
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