[OSM-talk] Removing redundant routing instructions
lester at lsces.co.uk
Mon Apr 27 16:10:53 UTC 2015
On 27/04/15 16:49, pmailkeey . wrote:
> On 27 April 2015 at 13:52, Lester Caine <lester at lsces.co.uk
> <mailto:lester at lsces.co.uk>> wrote:
> On 27/04/15 13:17, pmailkeey . wrote:
> > Is the 'through route' and 'the same road' the same thing ? and does it
> > mean that the road number stays the same or that you do not cross the
> > white paint ?
> One of the routes I follow regularly is an old Roman cross road which is
> straight, but crosses several more major roads with give way or stop at
> every junction. It is the one B class road, but crosses white paint at
> every junction. So there is not a general rule that can be applied. The
> place 'through route' would be helpful is where a road bends at a
> junction, and the main route route is not straight on. In the example
> given, the road name changed and if there is no road reference to
> override that then either you announce the turn, or you need something
> else to switch it off?
> I think the answer is that less ambiguous terminology is needed. 'Turn
> off' and 'stay on' are ambiguous.
> Also, instructions relying on something else aren't good, e.g. Follow 'A1'.
As I said ... 'turn onto A46' when one is already on the A46 ... As long
a one has an identifier that matches before and after a junction, then
the speech set CAN change. Where you have a traffic route that has road
names then it should perhaps be optional to use the road names and while
the 'A' route gives 'stay on', the change of road name gives the 'over
junction to yyy'. With unnamed roads then something else would be needed
to identify the through_route, but if that is an extra tag, or just
'give way' on the other connections just needs some agreement.
While we don't 'tag for the routers', a few common ground rules that
ensure that how a junction is navigate can be consistently 'routed'
would not hurt and is just sensible data to be included in the database.
>From a rendering point of view it should allow the 'white lines' to be
added even if they don't physically exist. While a give way should have
road markings, often these days it IS only a sign.
Lester Caine - G8HFL
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