My nav system knows the road type (primary, secondary, etc.) and then
has settable speeds based on the type - 65 mph primary, 50mph
secondary, etc.

'Good enough' estimate, but the realtime traffic/weather seems very
useful. This is doable using traffic & weather data from existing
services that could be piped to the OpenMoko (or any device) say as a
GeoRSS stream and then used to update predictions either on a server,
or the handset. At least let you know things are "bad" ahead.

On 4/10/07, Tim Newsom <[EMAIL PROTECTED]> wrote:

On Tue, 10 Apr 2007 6:12, Dean Collins wrote:
> Yep, coding easy to do however issues are-
>
> Mapping of roads and associated speed limits, almost non existent in
> the
> commercial space let alone in the open source space.
<snip>
> Regards,
>
> Dean Collins
> Cognation Pty Ltd
> [EMAIL PROTECTED]
> +1-212-203-4357 Ph
> +1-917-207-3420 Mb
> +61-2-9016-5642 (Sydney in-dial).
>

The last navigation system I had was able to predict how long it would
take for me to get where I was going over many different
roads..(highway,streets.. Etc) and then adjust it based on my actual
speed and the distance remaining.  I think the speed limits are in there
also for that purpose.
--Tim

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--
Andrew Turner
[EMAIL PROTECTED]        42.4266N x 83.4931W
http://highearthorbit.com              Northville, Michigan, USA

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