With the TREK services or an own Valhalla, the day plan, the road trip and
the other ways of a leg are routed by Valhalla on foot, by bike and by car,
twenty locations a request. A day it cannot answer (relay refusal, time out,
no way for a leg) goes to OSRM whole and without a word; it is never handed
to FOSSGIS unless it avoids something only Valhalla can avoid. With FOSSGIS
nothing changes: OSRM routes the days and Valhalla the avoidances.
A Valhalla answer is cached under its own key beside the OSRM one, so
switching engines never serves a day from the other engine. The Valhalla
day routing moves out of RouteCalculator into valhallaDayRoute.ts.
Maurice
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