[Tagging] 'ongoing' U-turn restriction

Colin Smale colin.smale at xs4all.nl
Thu Dec 8 11:25:56 UTC 2016

Martin, your interpretation is jurisdiction-dependant. There is
sometimes a distinction between single and double lines as well
(Queensland is an example I just found). The objectively verifiable fact
is the road marking, thereafter you have to interpret the local laws to
understand its effect. A no-overtaking sign is just as "variable" as a
continuous line - it can mean different things in different

If we map the road markings and signs, we cannot be wrong. If we try to
map their effects, and do it badly, we will miss a lot of information
which may be relevant to e.g. motorcyclists or tractor drivers. Mapping
the effects properly is a lot of work.... "no overtaking except to pass
agricultural vehicles or one motorcycle without sidecar overtaking
another, PLUS no turning to cross the line except to access a property
for vehicles < 3.5t" (random invention but perfectly existable) 


On 2016-12-08 11:35, Martin Koppenhoefer wrote:

> sent from a phone 
> On 8 Dec 2016, at 09:36, Volker Schmidt <voschix at gmail.com> wrote:
>> how we tag, on two-way roads, continuous middle lines (or double continuous middle lines) that imply continuous stretches of road with "no-u-turn", no passing/overtaking, and "no-left-turn" (in countries with right-hand traffic).
> it is a common misreading of continuous lines to believe they mean no passing/overtaking, but they don't. You may not cross the line, but if there is sufficient space you can still overtake/pass by other vehicles (i.e. in many situations the line does indeed prevent from overtaking (legally) because of lack of such space). 
> One osm tag for this is "divider" but it is neither promoted nor widespread: http://taginfo.osm.org/keys/divider#values 
> cheers, 
> Martin  
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