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[mkgmap-dev] question about ignored no_u_turn restriction

From A. Carlos anorcarlos at hotmail.com on Sun Jul 5 15:01:29 BST 2015

 There I draw two routes, one in each direction, since there is a false median, then with 2-way, it's easy for a restriction



Anor                                                              Concórdia SC   

Date: Sun, 5 Jul 2015 15:53:50 +0200
From: ben at bagu.org
To: mkgmap-dev at lists.mkgmap.org.uk
Subject: Re: [mkgmap-dev] question about ignored no_u_turn restriction

Hi Thorsten,

Thanks for your reply. This type of restriction is probably a country specific thing. In Ontario Canada, you can make u-turns at intersections (regardless of the road is separation) if there is no sign indicating that you can't make the u-turn. Here's the information directly from the Ontario Ministry of Transportation:


I realize that the link I sent previously is in the US but I suspect that it's the same policy there which is why the restriction is tagged like it is.

Since the tagging seems to be valid, does the Garmin format support this type of restriction? If not then it's probably a good idea to indicate this in the warning message. Maybe the message should also be changed to an info message if there's no problem with the data. Does anybody have other insights?

Thanks, Ben

On Sun, Jul 5, 2015 at 2:47 PM, Thorsten Kukuk <kukuk at suse.de> wrote:
On Sun, Jul 05, Ben Konrath wrote:

> Does anybody know why this particular restriction is being ignored?

Beside that this particular type of restrictions doesn't make

any sense to me, I would guess the GARMIN format does not support it.

If the to and from ways are the same, I have never seen a sign forbidding

u-turns. Only, if you have two ways, structural seperated. But then I

should tag the street that way and the restriction will not be ignored.



Thorsten Kukuk, Senior Architect SLES & Common Code Base

SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nuernberg, Germany

GF: Felix Imendörffer, Jane Smithard, Dilip Upmanyu, Graham Norton, HRB 21284 (AG Nürnberg)


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