[Talk-ca] Highway recoding

[Daniel Begin]

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:scruss at gmail.com] 
Sent: July-23-15 08:44
To: talk-ca at 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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