[mkgmap-dev] [PATCH v1] - add option to specify right hand drive

Fri Sep 25 09:26:08 BST 2009

Quoting Mark Burton <markb at ordern.com>:

>
>
> The attached small patch implements a --rhd option that sets a couple
> of bits in the map data that tell the GPS that the vehicles are RHD and
> that roundabouts are navigated in a clockwise direction. This will make
> the little roundabout piccy shown in the top left of the screen (on the
> Nuvis, at least) have the correct sense for the few countries that drive
> on the left.
>
> Should have done this months ago when it was previously discussed,
> sorry.
>
> It could be done automatically by sensing the roundabout direction but
> I'm feeling too lazy to write that code for now.
>
> Mark
I thought roundabout direction was already "sensed" this way?  My GPS  
has routed me the "right" way and the "wrong" way around roundabouts,  
and the "wrong" way ones are always those where the underlying OSM  
data has the way going in the wrong direction (which I have then  
subsequently corrected where I remember).

And maybe I'm quibbling on semantics, but shouldn't the --rhd apply to  
the road system/map, rather than the vehicles on it?  After all,  
left-hand drive vehicles can drive in the UK, for instance?

-- 
Charlie