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Road speed data
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chrisdhall
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Joined: Nov 12, 2004
Posts: 45
PostPosted: Mon Feb 14, 2005 6:11 pm    Post subject: Reply with quote
Thanks for the info

Another question. What are the units of the road speeds in the USERTRIP file? MPH or KM/H? Is there likely to be any difference between the US and Europe versions?
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Skippy
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Pocket GPS Verifier


Joined: 24/06/2003 00:22:12
Posts: 2946
Location: Escaped to the Antipodies! 36.83°S 174.75°E
PostPosted: Wed Mar 23, 2005 12:41 am    Post subject: Reply with quote
ianhb wrote:
I´m not convinced that CoPilot uses the road speeds to determine the route.


The routing algorithm in CoPilot is seriously broken.

When you choose the "Quickest" route, CoPilot will try and use the motorway if at all possible and ignore other road types. This doesn't necessarily give the Quickest route and can sometimes add a large time and distance to your journey.

Also, the "Shortest" route also ignores many minor road types unless it's absolutely necessary to get to the destination using these roads.
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PONDEROUS
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Joined: Aug 25, 2004
Posts: 634
Location: Lincolnshire, England
PostPosted: Sat Apr 09, 2005 12:04 pm    Post subject: Reply with quote
Calculating a shortest distance does not involve a time factor, while of course calculating a quickest route does. Hence, Road Speed adjustments relate to Quickest routing, while Road Type bias adjustments are to do with Shortest routing.

It is essential not to mix up these two concepts. However, it may be that ALK themselves, and indeed the PocketGPS forum team have the concepts mixed. Please see the following thread:

Sticky: CoPilot 5 ETA - Tweaking Road Speeds
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