[mkgmap-dev] Turn restriction angle checks

Sun Mar 30 13:34:07 BST 2014

Hi Marko,

> IMO, mkgmap should not silently ignore anything. We should generate a 
> warning too.
> 
> BTW, one more case that I do not know if you are handling yet: Issue a 
> warning if the result would not be any different if the turn restriction 
> did not exist. This is not only about oneway direction. For example, if 
> there is only_straight_on on a road with no junction, a warning should 
> be issued.

Sure, whenever a restriction is ignored there should be a reasonable explanation.

> 
> BTW, I accidentally loaded a relation somewhere in Russia and downloaded 
> the surroundings. There were lots of no_u_turn on every crossing of a 
> major road. That kind of micro-mapping does not exist over here; I guess 
> that mappers expect people to apply common sense and not make a u-turn 
> as soon as the navigator suggests it, no matter what.
> 
> I think that no_u_turn restrictions are somewhat a matter of a local 
> convention. In the US it is common to forbid left turns and U-turns 
> except in a few junctions. In Finland, that practice only exists on some 
> major through-routes in cities.

AFAIK   we have no no_u_turn restrictions in Germany, so for me they all look obsolete ;-)

Gerd

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