The Work at Height Regulations 2005 (WAHR) apply to all work at height where there is a risk of a fall that is liable to cause personal injury. The WAHR are relevant to the construction industry, as well as to window cleaning, industrial cleaning and maintenance, container top working in docks, working on the back of a lorry, erecting bill posters and arboriculture activities. The regulations also cover workers who are paid to lead or train climbing and caving activities in the adventure sector.