[Talk-us] Trunk

Evin Fairchild evindfair at gmail.com
Sat Oct 14 04:42:41 UTC 2017


The concept of expressway is not as well known as a freeway. Many people,
especially in places like NYC, might consider expressways and freeways to
be interchangeable terms. Heck, even in Tulsa, you have the Broken Arrow
Expressway, and the Sand Springs Expressway, which, despite being called
expressways, have full access control and no at-grade intersections and no
places where one crosses into oncoming traffic.

Also, as for super-twos, let's not discuss that right now. I'd prefer us to
stick to talking about trunk roads *only*, since that's the topic of this
thread. Let's not go on that tangent, and I'd like to know what you think
about how the standard Mapnik render differentiates between undivided and
divided trunk roads. It's a pretty obvious distinction to me, and you can
*easily* tell the two apart. If anything, I think that that helps us out
here.

On Fri, Oct 13, 2017 at 9:26 PM, Paul Johnson <baloo at ursamundi.org> wrote:

> On Fri, Oct 13, 2017 at 11:00 PM, Evin Fairchild <evindfair at gmail.com>
> wrote:
>
>> Another thing worth adding is that if we do decide to tag two-lane roads
>> as trunk, you will still be able to tell the undivided two-lane roads apart
>> from the divided four-lane roads, even at zoom 5. I'm sure many of you have
>> noticed if you've looked at Canada at zoom 5, you can see that some of the
>> trunks are thicker than others. If you zoom in more, you'll notice that
>> said thicker roads are divided/ dual carriageway, whereas the thinner ones
>> are undivided roads. Also, the same is true with motorways, so we could
>> theoretically tag super-twos as motorways and still tell them apart from
>> actual Interstate freeways. This has been done extensively in New Brunswick
>> and Nova Scotia, and I quite like it. But we probably shouldn't go down
>> that rabbit hole at this point...
>>
>
> I also disagree with the idea that (at least in the US, though also
> relevant to the rest of North America to a lesser extent) a super-2
> qualifies as a motorway.  I generally consider the minimum requirements for
> motorway as dual carriageway, with each carriageway having a minimum of two
> lanes, barring temporary traffic controls (such as a reduction to one lane
> each way, undivided, very common when a DOT needs to restrict access
> completely to one motorway for routine maintenance or immediately after a
> major disaster; most frequently personally experienced in California,
> Oklahoma and Kansas, and routinely planned for to the extent that permanent
> crossover "X" links are installed regularly in Kansas and Oklahoma).
>
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