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