On 11/28/18 13:43, Poutnik the Wanderer wrote:
Ideals are meant in the contest of the used routing profile.
It may be the motorway for fastest car route. Rating 1.4 would be for a
road 1.4 times slower.
It may be a road with nominal speed close to optimal fuel
consumption.Rating 1.4 would be for a road with 1.4 times higher fuel
consumption.
It may be a road being a trade-off of the both
It may be a curvy 3rd class road for sightseeing slow driving.
It may be pleasant cycleway or cycleroute for a trekking bike.
It can by a wooden trail for a MTB.
It can be a path trail for hiking.
I meant where is it is encoded and where does it come from.
For shortest-distance, it's obvious.
For something like car and shortest-time, it seems the motorway
assumption makes sense. Is the fastest possible speed encoded as a
constant in the routing profile, or is there some max over all roads in
the map, or is 160 km/hr assumed for car routing regardless, or ?
I agree that for other profiles, and other notions of optimality, it
gets more complicated.
The rest is on developers.
They want be on the safe side.
For short routes with long straight-line roads with near optimal rating,
even coefficient 1.4 can lead to wrong results
Meaning if there really is a near-optimal straight road but it's
somewhat out of the way to get to it, 1.4 can lead to a route which does
not use that fast road, and is worse? If so, that makes sense to me.
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