Re: [Talk-us] An actual mini roundabout!

[Clifford Snow]

On Fri, Dec 9, 2016 at 6:38 PM, Bill Ricker  wrote:

>
> Does it do harm to treat a mini as a regular roundabout in the land that
> isn't even doing big roundabouts right yet?
>

Probably no harm but if you were a trucking company looking to deliver
goods to an address was only accessible via a roundabout, you might want to
make sure the truck could transverse the roundabout. The roundabout in my
example has a small diameter which could preclude longer trailers from
using if the center was impassable. To get to the businesses would mean
driving 5 miles south on the interstate before heading back on the frontage
road.

I think the document that went with this roundabout is pretty clear that it
is intended as a mini-roundabout, even with the raised apron. The weather
is pretty crummy right now or I'd get some pictures.


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Re: [Talk-us] An actual mini roundabout!

[Paul Johnson]

On Fri, Dec 9, 2016 at 8:38 PM, Bill Ricker  wrote:

> I have seen a number in US with crown height low enough that emergency
> vehicle can go right over and trailers can cheat up.
>

Right, that's normal usage, but an actual mini roundabout is literally just
painted on the ground, not a raised apron.


> For USAn usage, even if they are eligible for tagging as a mini roundabout
> node, that may be  confusing. Routing of "third right on roundabout" works
> ... "Left at intersection" could be dangerous advice.
>
>
Does it do harm to treat a mini as a regular roundabout in the land that
> isn't even doing big roundabouts right yet?
>

 Hence the distinction on the mini roundabout I mentioned at the start of
the thread versus Clifford's example, based on prevalent global usage and
the wiki documentation.
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Re: [Talk-us] An actual mini roundabout!

[Mike N]

On 12/9/2016 9:49 PM, Rihards wrote:

definitely. please only tag as miniroundabouts places that you would
pass straight in a normal car :)

similarly, if there is an island, it is better to map a circle way, not
just a node with turning_circle - the latter should be used only for
"full" circles without any objects in the middle.


There is also turning loop for turning circles containing islands - 
https://wiki.openstreetmap.org/wiki/Tag:highway%3Dturning_loop



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Re: [Talk-us] An actual mini roundabout!

[Rihards]

On 2016.12.09. 08:21, Paul Johnson wrote:
> On Thu, Dec 8, 2016 at 7:12 PM, Clifford Snow  > wrote:
> 
> Elliott,
> Here is a mini-roundabout [1] in my town along with an article [2]
> that talks about how much less it costs to install a mini-roundabout.
> 
> [1] https://www.dropbox.com/s/1k2usg6abxi8kal/mini-roundabout.png?dl=0
> 
> 
> [2] http://www.djc.com/news/co/12069069.html
> 
> 
> 
> That's got a curbed truck apron in the middle,  I wouldn't call that a mini.

definitely. please only tag as miniroundabouts places that you would
pass straight in a normal car :)

similarly, if there is an island, it is better to map a circle way, not
just a node with turning_circle - the latter should be used only for
"full" circles without any objects in the middle.
-- 
 Rihards

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Re: [Talk-us] An actual mini roundabout!

[Bill Ricker]

I have seen a number in US with crown height low enough that emergency
vehicle can go right over and trailers can cheat up.

For USAn usage, even if they are eligible for tagging as a mini roundabout
node, that may be  confusing. Routing of "third right on roundabout" works
... "Left at intersection" could be dangerous advice.

Does it do harm to treat a mini as a regular roundabout in the land that
isn't even doing big roundabouts right yet?
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Re: [Talk-us] An actual mini roundabout!

[Clifford Snow]

The roads leading up to the roundabout are either 25 or 35MPH streets. If
there are trucks, they are likely coming from the 25MPH roads. I believe
the intersection is marked 20MPH caution sign.

I'll take a picture of if from street level, after the snow melts.

On Thu, Dec 8, 2016 at 11:49 PM, Paul Johnson  wrote:

> On Fri, Dec 9, 2016 at 1:04 AM, Clifford Snow 
> wrote:
>
>>
>> On Thu, Dec 8, 2016 at 10:21 PM, Paul Johnson 
>> wrote:
>>
>>> That's got a curbed truck apron in the middle,  I wouldn't call that a
>>> mini.
>>
>>
>> When I added the roundabout, I agreed with you, but the more I drive
>> through it, I've come to realize that it's really a mini. It's low enough
>> that a truck could easily drive over. The rest of the roundabouts the
>> county is installing are all the typical roundabout. Although there isn't
>> much truck traffic at the intersection.
>>
>
> Yeah, but what happens if you just whip across it in your average sedan
> without slowing down?  A true mini roundabout you might feel a slightly
> sharper crown to the intersection, doing this on a truck apron's probably
> going to do some suspension damage.
>



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