Fleet size follows demand, not population. The workable method is to count the calls per day, multiply by average response and turnaround time, divide by the available hours per vehicle, then add a reserve for maintenance and peaks. Most fleet plans fail because they use a ratio per population instead of their own call data.
The basic calculation is a simple capacity model. If a service answers forty calls a day with an average of ninety minutes per call including response, on-scene time and hospital handover, that is sixty vehicle-hours of work. A vehicle available for twenty hours a day provides twenty hours, so three vehicles cover the workload with no slack at all.
Slack is not optional. Vehicles break, crews take leave, and demand is not uniform - there is always an evening peak and a seasonal peak. A fleet sized exactly to average demand fails on the busiest day of the year, which is precisely the day it matters most. A common planning assumption is to add twenty to thirty percent for availability.
The category mix matters as much as the count. If most calls are inter-facility transfers of stable patients, a fleet of Type A vehicles with one or two Type C units will serve better and cost less than a uniform fleet of Type B vehicles. The mix should be built from the call profile, not from a preference for the highest specification.
The last variable is geography. A rural service with long distances needs fewer vehicles but higher utilisation per vehicle, and vehicle reliability becomes more important than in a city where a spare can arrive in ten minutes. In remote areas, a vehicle that cannot be replaced quickly should be specified with more redundancy in critical systems.
Ratios exist but they hide more than they reveal, because call volume, geography and hospital handover time differ enormously between services. Your own call data is a better basis than a published ratio.
The two are not interchangeable. A spare vehicle covers maintenance downtime; it does not add crewed capacity. Decide which constraint is binding before buying.
Type A is a patient transport vehicle, Type B is an emergency ambulance, and Type C is a mobile intensive care unit. The categories come from EN 1789 ...
Pricing and orderingHow much does an ambulance cost?An ambulance is quoted per configuration, never from a list price. The chassis usually accounts for 35-50% of the total; the medical module, electrica...
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