Beachy Head is famous for its white chalk cliffs extending over 150 meters above sea level. They are beautiful, and deadly. Crosses near the cliff edge remind visitors of that fact.
Some people slip because they get too close to the edge. There are warning signs and a negligible fence made from a single wire, but only at the highest point.
Unfortunately, Beachy Head is a well-known location for suicide attempts. Organisations such as the Samaritans and the Beachy Head Chaplaincy patrol the cliffs 24 hours a day, seven days a week. They reach out to people, encourage them to seek help, and often succeed in preventing suicide.