[OSM-talk] Clarifying and representing road markings at junctions

[Frederik Ramm]

Hi,

Matt Williams wrote:
> On the left you will see the physical plan of a road junction near
> where I live. The way that it would be represented in the OSM data
> model is shown on the right. 
[...]

Your problem can and should be solved by a relation that models: "to 
travel from node X to node Y on way(s) A,B,C the instruction to display 
is: ....".

There are probably some clever algorithms to get some of these cases 
right but there will alway be cases that have to be modeled explicitly.

The same kind of relation could also be used to describe signposting 
("to travel from X to Y on way(s) A, B, C follow the signs towards: 
..."). This is also knowledge that cannot be synthesized.

Bye
Frederik