[Talk-GB] Primary or Trunk?

[Tom Hughes]

On 03/11/13 19:41, Tom Hughes wrote:
> On 03/11/13 19:07, Jonathan wrote:
>
>> What we should be mapping is reality, so that people can use that data
>> to build on.  Whether a road is signed in Green, Pink or Purple tells a
>> user nothing, it may have a legal definition but that is all.  The tag
>> we give it should tell the user something about the road's capabilities,
>> importance, size and potential timings/traffic flow.  A Trunk road that
>> is a dual carriageway with a maxspeed of 70 mph is very different to a
>> Trunk road that winds around fields and has a maxspeed of 50 mph or less!
>
> The Primary Route Network is not arbitrary. It is made of of the most
> important routes connecting a defined set of major towns. Even where
> that is not a particularly major road it is still the main road between
> those towns and as such deserves to be highlighted.

See wikipedia for more on this:

   http://en.wikipedia.org/wiki/Roads_in_the_United_Kingdom#Classification

Basically a road in the PRN is one which "provides the most satisfactory 
route for through traffic between places of traffic importance".

Tom

-- 
Tom Hughes (tom at compton.nu)
http://compton.nu/