Three police forces in the north of England are set to merge areas of their operations.
Durham, Cleveland and North Yorkshire constabularies will integrate major crime, response to civil emergencies and disaster victim identification.
The Evolve programme could extend to other specialist areas in the future, but all forces have pledged that community policing will remain local.
The move is aimed at making combined savings of up to £2m.
North Yorkshire Chief Constable Dave Jones said it made sense to look beyond county boundaries to meet police challenges.
Michael Banks, Durham's deputy chief constable, said it had a "proud history of partnership and working collaboratively with other police forces and public sector organisations."
Acting Chief Constable for Cleveland Police, Iain Spittal, said: "The appetite from the three chief constables and PCCs [Police and Crime Commissioners] is such that we have hit the ground running.
"It's an exciting and innovative piece of work, but there is still a great deal of work to do."