at least one "Chase car" staffed with a paramedic at any given time. Additional Chase-cars are staffed as need dictates. 2010 policy revisions state there must always be one supervisor per operations division but currently no more than two are ever on duty simultaneously. This leaves at least one division without a supervisor on a recurring basis. Equipment Ground transportation LMEMS utilizes a fleet of modular ambulances manufactured by Lifeline Emergency Vehicles from Sumner, Iowa and Ford Explorer response vehicles called chase-cars. Currently three styles of ambulances are in use. Specimens of the former LFD and JCEMS (slant-sided) ambulance types remain in use until retirement with new paint and striping. The newest (post-merger) ambulances retain the straight-side feature of the former LFD type and are taller, longer, and heavier. In 2012, Ford Motor Company announced they would no longer manufacture the Econoline van ambulance prep package and subsequently LMEMS has opted to begin procuring Type I vehicles based on the F-450 pickup truck chassis. The first delivery of Type I ambulances occurred in 2013. Most LMEMS response vehicles, including all ambulances, are fitted with satellite transponders that constantly track the exact location of the vehicle, map the potential route to a call, and determine which unit is closest to the emergency. The ambulances have emergency lights and sirens along with air horns to help them warn motorists to move over. They also have radios to communicate with other units as well as the dispatcher. All ambulances are stocked with a full complement of advanced life support equipment including LifePak 15 cardiac monitor–defibrillators, LUCAS II mechanical chest compressors, and oral and intravenous medications and fluids. Each ambulance can transport up to three fully immobilized patients. All crew members are trained and equipped with protective gear to treat patients potentially contaminated with hazardous materials. All charting and patient care information is collected and distributed electronically, eliminating paperwork and reducing the possibility of patient privacy compromise. Electrocardiographs (EKG) can be transmitted wirelessly from the cardiac monitor to the receiving hospital in the advance of the patient's arrival. Area of responsibility and divisions Louisville Metro EMS has the largest area of geographical responsibility of any Louisville Metro public safety agency. It is the sole provider of emergency medical services to 96.5% of the of Louisville-Jefferson County. The cities of Anchorage, Jeffersontown, and St. Matthews maintain their own EMS providers, however, LMEMS is required to