The Central Motorway Police Group (CMPG) is a co-operative operation between three police forces in the West Midlands of England. Officers from the three forces involved - Staffordshire Police, West Mercia Police and West Midlands Police - provide a dedicated policing service on several hundred miles of the motorway network in the West Midlands, from the boundary with Cheshire in the north to Gloucestershire and Warwickshire in the south, and from Wales in the west to Derbyshire and Warwickshire in the east.