[Tagging] New Proposal

News news at pointdee.co.uk
Thu May 2 16:25:11 UTC 2013

On 02/05/13 00:40, Dave F. wrote:
> On 01/05/2013 18:26, Philip Barnes wrote:
>> That is just one example, this problem does not only exist with grade
>> separate roads. Take this example,http://osrm.at/36D
>> To stay on the A511 no instruction to turn is given, therefore it is
>> easy to continue straight ahead.
> The blue line shows it knows where to go. There's nothing wrong with it
> calculating the directions, but, as kytomaa suggests, it's missing a
> written instruction.
> The OP's assertion that it's impossible to determine is a bit dramatic.
> The orientation of the ways to each other & that a road reference
> appears to change is irrelevant - if users wants to go to Haslingden,
> that's the road they should be on. Instructing them can't be that hard:
> "Take next left junction to stay on the A56". or how about this:
> *http://tinyurl.com/br5c3fm*

If you follow the directions at http://osrm.at/374 you will continue 
straight past the turning you need to take and end up in Rawtenstall 
which doesn't give a good impression of the data or routing software
and is wrong because routing software cannot reliably determine that you 
need to make a left turn here. This simple relation fixes this by saying 
that at node x, connected to ways a, b and c then a-x-b is the 
through_route (as indicated by markings on the road) and so any other 
way must be left or right. With this information routing software can 
then inform the traveller in plenty of time that a turn needs to be made


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