Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
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An example of a triangulated irregular network. The known data sites (black points) are triangulated to form a convex hull.
Given the uncertainties around the potential number of claims, an expert has questioned why the NHS didn't choose a contract that would have allowed it to "review the situation" once more reliable data was available.