main user of the centralised, borderless model. Officers start and end their shifts at a patrol hub but are not officially confined to any subdivision of Hampshire while at work. The strand also includes call handlers and control room staff who work very closely with the police officers on the ground. This section is filled mostly with skilled and experienced police officers who become highly trained police vehicle response drivers (as not all police officers are trained or allowed to drive with lights and sirens activated). They also make up the largest number of Taser carriers in the force who often deal more serious incidents usually involving weapons that are not firearms or an unacceptable level of risk that requires a justifiable use of force. Investigations This strand consists of the criminal investigation department and custody staff. The investigation strand is more centralised than before the reorganisation; with its detectives, other officers and police staff investigators (PSIs) being based at the four police stations with regularly-used custody suites: Northern Police Investigation Centre in Basingstoke Southampton Central Police Station Eastern Police Investigation Centre in Portsmouth Newport Police Station on the Isle of Wight. Within each PIC you will find specialist departments. These include rape investigation teams, child abuse units and major crime teams alongside the Investigation department (formerly CID). This strand also contains special units that are set up to combat particular crime areas such as cyber crime or drug related violence (Operation Fortress). Joint Operations Unit (JOU) This section consists of the units that are shared with Thames Valley Police. These include the road policing units, training sections, firearms units and dog units of the two forces. The Joint Operations Unit is overseen by an assistant chief constable, who is a joint employee of both forces. Roads Policing Unit (RPU) The Roads Policing Unit patrol motorways and trunk roads across the two forces' areas. In Hampshire this is made up of large sections of the M3, all of the M27, the M271 and the M275 together with parts of the A3, A27, A31, A34 and A303. In addition to providing an emergency response to incidents on the road its work is directed towards reducing casualties and offending and in particular at disrupting the activities of travelling criminals. The unit operates from three bases in Hampshire: Havant (near the M27 and M275), Totton (near the M271 and M27) and Whitchurch (near