Thank Russel,
Your description is pretty close of the one I had in mind (about trunks) before 
I found the Canadian definition was referring to the mentioned document.

Cheers,

Daniel 

-----Original Message-----
From: Stewart C. Russell [mailto:scr...@gmail.com] 
Sent: July-23-15 08:44
To: talk-ca@openstreetmap.org
Subject: Re: [Talk-ca] Highway recoding

The definition of ‘trunk’ is a difficult one, if based on the UK understanding. 
Like its unwritten constitution, trunk roads in the UK are more on a "know it 
when I see it" basis.

Pretty much the only definitions I can think of that would be generally 
applicable are:

* a trunk road goes from one city/town to another.

* no parking at the side of the road.

* something above the urban speed limit applies (though there are often nasty 
brief exceptions, like a roughly 200m stretch of 30 mph that used to adorn the 
A80, dammit).

A trunk road isn't always dual carriageway. It can have traffic lights, 
roundabouts or (rare, in the UK) stop signs. Depending on its age, it may 
bypass towns and villages. Older trunk roads may also have all the usual roads 
entering it, while newer ones are likely to have on-ramps.

In summary, the UK definition is so riddled with unwritten exceptions that 
trying to apply it rigorously in even one province in Canada will be 
frustrating. And no matter what you do, you'll always get some rogue user that 
comes along and adds their own tagging. It's a sair fecht …

cheers,
 Stewart

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