[OSM-talk] Turn restrictions vs allowances?

[Stephen Hope]

We have a similar thing here in Queensland, Australia.  You can't do a
U-turn at any traffic lights unless there is a sign specifically
saying that you can. I think this is the same across the whole
country, but I'd have to check. There are no signs saying you can't at
the other lights, you're supposed to know (or at least infer it).
Intersections without traffic lights are the opposite - you may do a
u-turn unless there is a sign saying you can't.  I haven't got around
to tagging any of them yet, so haven't had to figure out how to do it.

Stephen

2008/10/23 Andy Robinson (blackadder-lists) <ajrlists at googlemail.com>:
> Matias D'Ambrosio wrote:
>>Sent: 22 October 2008 8:21 PM
>>To: talk at openstreetmap.org
>>Subject: [OSM-talk] Turn restrictions vs allowances?
>>
>> What is the opposite of a turn restriction? I can't find it and no one
>>answers on IRC.
>> Turning left is forbidden everywhere in my country on two way roads when
>>there is no specific traffic light for it, and I assume it's the same in
>>many
>>other countries.
>
> Interesting, which country are you talking about since clearly it does
> differ around the world. Essentially in the UK you can turn left or right at
> any junction, with or without a traffic signal. Generally the only time you
> cannot is when a no left turn or no right turn sign is present. I'm guessing
> that the reason the "turn restrictions" tagging has come about is because
> most countries are the opposite to yours rather than the same?
>
> Anyway, I agree it sounds like to need a turn_permitted= type tag for your
> area.
>
> Cheers
>
> Andy