Quest Routing

Keith Chapman · Apr 3, 2007

Why does this happen.

I set of to go somewhere and ask my Quest to go shortest route, but on the return trip I ask for shortest route back to where I started and I get sent on a different route? :confused:

I would have thought that the shortest route one way would also be the shortest return :nenau

Twotter · Apr 3, 2007

One way roads ???

:nenau

Keith Chapman · Apr 3, 2007

Twotter said:
One way roads ???

No, all on two way roads :nenau

Eastriding2002 · Apr 3, 2007

I noticed this when I "inverted" the route back from Heathrow on mine, it took me a totally different route back? Or would have! A msytery?

chasr · Apr 3, 2007

This question has been asked a couple of times before, and Pan E responded (where's he gone, anyway :nenau

). He said it was something to do with the space-time continuum, or something like that.

Bumpkin · Apr 3, 2007

I've noticed an anomaly that caused a similar problem on my Quest where a particular junction wouldn't allow a right turn when in reality this was permitted. This caused a totally different return route as it detoured to avoid this.

Do you get similar results in Mapsource?

If your route has some close viable alternatives then a few small one way systems or even a roundabout or two might sway the selection of the roads it follows :nenau

I don't think anyone here knows the workings of Garmin's routing algorithm, and for that matter the road attributes within the mapping data, that effect the choice of route.

nick · Apr 3, 2007

Neither the maps nor the algorithms will ever be perfect.

It is an almost unimaginably large and complex problem to solve.

Surely a successful navigation by GPS is to get you from A to B, even if it is not the 100% perfect or optimum solution.

Quest Routing

Keith Chapman

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Twotter

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Keith Chapman

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Eastriding2002

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chasr

Well-known member

Bumpkin

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nick

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