The majority of the department's manpower is assigned to the Patrol Division, which provides preventive patrol, complete investigation on field level incidents and preliminary investigation on all incidents and calls for service. Most Patrol Division officers are assigned to an 8 hour shift made up of 6 to 8 patrol officers and 2 sergeants. To provide additional staffing during peak periods, a small number of additional officers are assigned to an overlap shift from 7 PM to 3 AM. In addition to normal preventive patrol, Patrol Division officers may be assigned to directed patrol assignments based on law enforcement need, an increase in criminal activity or citizen complaints. Patrol officers also perform all manner of traffic enforcement during their patrol activities.