[mkgmap-dev] [PATCH v3] heed the through_route relation when adjusting turn headings

Wed Feb 17 09:32:22 GMT 2010

Mark Burton wrote:
>
>> ..if you drive south-east on Kilfield Road...
>>     
>
> I have just tried routing on that road and mapsource did not give me a
> "turn right" at that junction. However, I have tweaked the code as it
> could get confused as to which is the through route as all the roads
> at that junction have the same name.
Yeah, exactly. And I can show you quite a few other residential roads 
where the same thing happens.

> So now the one-piece road will take
> precedence over the stub even though they have the same name. I will
> post a new patch shortly, please see if it does the right thing there.
>   
If that comes up today, I can test it tonight. Thanks in advance.

>> 2) Can we invent some way to mark up traffic lanes [...] one day we might find how "lane assist" works in 
>> Garmin maps and be able to code for it properly.
>>
>> I wonder if marking a lane like this one as "highway=primary" 
>> "primary=traffic_lane" "ref=A4076" (etc) would be useful and desirable 
>> and would you be able to handle it anyway?
>>     
>
> This is a difficult situation to handle. A problem is that if you
> don't tweak the heading for the link road you will then get "keep left"
> instructions for each exit you approach. It currently does a good job
> of not telling you to "keep left" on motorways and trunk roads and I
> would prefer that it stays that way. 
No argument there. That's why I suggest some sort of mark-up for the 
traffic lanes situation. It's a special-case, and another thing the 
mark-up would help with is to fix the complaints that "keepright" gives 
for junctions like that.

Now, there probably is an attitude out there that I shouldn't be doing 
this in the first place, but on approaching complex multi-lane junctions 
it would be good for the GPS to generate "get in lane" instructions. The 
"official" maps often do, and we should too if our maps are to be 
considered seriously.

If we do generate mark-up, we'll need to invent something that's 
GPS-independent of course, so it can be used by the Android and TomTom 
and other map projects out there.

> More thought required...
>
>
>   
Yup!
Steve

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