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In Austria however, by law, repositioning idle ambulances (apart from sending them back to a waiting location) are not allowed.
Furthermore – just for comparison reason – we have also implemented a random strategy, where the next waiting location for idle vehicles will be determined randomly.
According to a highly naï ve strategy one could relocate the ambulance to the closest feasible waiting location once it has finished serving a request.
After serving an emergency request they become idle again and can be assigned to a new request immediately or redeployed to a waiting location.
Only vehicles currently being idle (either at a waiting location, or just becoming idle after serving a request) can be assigned to requests.
First when selecting the next waiting location in a poor way, the systems capability to serve future requests is badly impacted.
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The ambulance service provider currently operates 14 ambulance vehicles which can be located at 16 different waiting locations.
When taking into account the state of the system (i.e. the situation from the waiting locations' point of view and the number of ambulances currently located there, as well as time dependent fluctuations in demand, travel time and the resulting changes in coverage) one can improve the systems performance dramatically.
Ambulances, when idle, wait at waiting locations to be dispatched to incoming emergency requests.
When selecting the waiting locations randomly (dotted line) the resulting average response time amounts to 5.12 minutes.
Waiting locations might be capacity restricted in terms of the maximum number of ambulances that can wait there at any point in time.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com