Some ems agencies use a system for ambulance deployment that involves placing ambulances in strategic locations to best meet the demands of call volume and ensure response times. this system is called:

System Status Management

System Status Management (SSM) this is basically the deployment of ambulances based on the hour-of-the-day and day-of-the-week in order to meet supply, defined as Unit Hours of Utilization (UHU), with anticipated demand, expressed as calls for service, in the attempt to provide faster response by locating ambulances at “posts” to best meet the demands of call volume and to ensure ambulances are nearer to their next calls.