POLICE will tell Halloween revellers to queue to get into Lan Kwai Fong this weekend in an effort to prevent dangerous crowds developing. Under the latest contingency plans to avoid a repeat of last New Year's Eve crush, in which 21 people died, police will only allow about 5,000 people into the area at any one time. Deputy Central district commander, acting Senior Superintendent Keith Ratcliffe, said once police had decided that enough people were in, anyone else would be asked to leave or, if they really wanted to party, to queue up. ''As people leave at one end, they will be let in at the other,'' Mr Ratcliffe said. ''We are hoping people will respect the need for caution and will not make any trouble, but we are confident we will be prepared to handle any situation as it may arise.'' Police have urged people to keep away from the area, but have formed plans to implement the post-New Year findings of Mr Justice Bokhary should the 20,000 people who crammed Lan Kwai Fong last Halloween night return. Police Tactical Unit officers - the force's riot-control specialists - will be among the 120 police in the area, patrolling the entry cordon near Wellington Street and the exit at the top of Lan Kwai Fong. Staff will be marshalled via two observation posts and one command centre in the street, backed by two Auxiliary Medical Service teams and a doctor. Cordons, which have the backing of the Lan Kwai Fong Association, will be set up on Friday and Saturday night, as well as on Sunday - Halloween.