[OSM-talk] Next: Relation name (WAS: Removing redundant routing instructions)

Lester Caine lester at lsces.co.uk
Tue Apr 28 20:25:37 UTC 2015

On 28/04/15 17:14, pmailkeey . wrote:
>     My point is that this is not a 'relation' problem, but rather that the
>     through_route tag was getting mixed up with traffic management tagging. 
> Is there need for a through route tag as well as the give way tag ? 

Yes ... The give way/stop is traffic management and while one may be
able to determine the named through route, just from that, it may not
work both directions.

> How is the whole concept affected by roundabouts (mini) - where all '3'
> arms are 'give way'

That is perhaps one of my biggest gripes with routing software which
simply ignores them, at least a cross the mini-roundabout would help
rather than 'turn right at roundabout' which is actually half a mile
further on :(
But this is where what is the 'straight on' route may well not be clear
even on the ground, and so if the road id changes then some additional
tag is necessary.

> What if the junction has more than one through route ? I'm thinking one
> arm in, one arm out (effectively dual carriageway) and one arm that's
> both in and out.

Travel direction deals with the dual carriageway bit, but I can think of
three mini-roundabout configurations I drive through regularly which
OSMAND simply ignores, but have a total of three 'in' routes and one
'out' going one direction, but going the other direction is difficult to
determine from the 'directions'. What is needed is proper lane
directions through the junctions, rather than a 'left' or 'right' which
are difficult even to decide when there is ALSO a road going across at
90degs :) 6 roads meet offset over two or three mini-roundabouts.

Lester Caine - G8HFL
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