On 2 February 2023 09:34:08 GMT, Volker Schmidt <vosc...@gmail.com> wrote:
>I do have a typical traversable roundabout close by. hgv=no is not correct,
>there are commercial activities around that need hgv access. The roads are
>adequate for that
>
>The angle between incoming roads is not a suitabla measure, as the
>traversable roundabout has a circular "belly", providing additional space
>for turning longer vehicles. The diameter of this circular turning space in
>this specific location is 12m. The maximum length for articulated trucks is
>generally 16m in Italy.
>
>The probable reason why I see relatively frequent problems there, is that
>the junction is represented on big-G maps as a normal roundabout (they do
>not have a specific way to represent traversable roundabouts) and the size
>of this roundabout is a bit large on their map. This junction is on a route
>to reach a company that repairs agricultaral machinery, that arrives on
>long flat-bed articulated trucks.
>
>Coming back to my original question: could we agree that:
>
>1) highway=mini_roundabout outside the UK is used to describe traversable
>roundabouts, provided the traffic rules are the same as on untraversable
>roundabouts
Most of my non GB driving experience is in France. Mini-roundabouts there use
the same blue sign as the UK.
Phil (trigpoint)
>2) diameter= x m can be used to describe the available turning area
>diameter, if it is roughly circular.
>3) we will look into defining an alternative way to describe the
>traversable roundabout area in a way similar to bridge or road geometry
>(and let us discuss that approach in a new thread)
>
>Volker
>
>
>
>On Thu, 2 Feb 2023, 09:58 Mark Reidel, <tagg...@mark.reidel.info> wrote:
>
>> On Thu, 2023-02-02 at 04:31 +0100, Matija Nalis wrote:
>> > If the actual issue is that HGV cannot pass some road, why not simply
>> > mark it as `hgv=no`? Besides being simple, it has the additional
>> > advantage that routers will actually already use it and direct HGVs
>> > somewhere where they can actually pass.
>>
>> Adding an access-tag like maxlength isn't the correct way to tackle
>> this, because:
>> a) there is no *legal* restriction that disallows a vehicle of a
>> certain length
>> b) it's not only about the length, but mostly about the turning radius
>> of trucks, which is not necessarily related to their length, especially
>> when they have more than 1 trailer.
>>
>> But overall, I don't see how this is of special importance for a mini
>> roundabout with a traversable surface, it being very much identical to
>> a regular crossing when you are allowed to go over the inner circle.
>> Shouldn't the angle between the two roads the vehicle wants to pass be
>> the limiting factor in that case?
>>
>> --
>> Mark aka Nadjita
>>
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