[mkgmap-dev] no_u_turn

Sun Oct 4 19:37:21 BST 2009

Carlos Dávila escribió:
> Mark Burton escribió:
>   
>> Hi Paul,
>>
>>   
>>     
>>> Can I make this a feature request then? :) Consider the following
>>>     
>>>       
>              X
>   
>>>         |
>>> A      B|       C
>>> --------+------->
>>>         |
>>> <-------+--------
>>> D      E|       F
>>>         |
>>>         \/
>>>         G
>>> ABC is oneway in direction ABC
>>> FED is oneway in direction FED
>>> BE is twoway but is marked with direction BE
>>>
>>> U turns are not allowed for FEBC nor are they allowed for ABED
>>>
>>> I have several of these near me and I'm sure they're fairly common (if
>>> not yet in the OSM database). Current mkgmap maps will tell me to make a
>>> U turn (FEBC or ABED)
>>>     
>>>       
>> Well, that's a lovely bit of ascii-art. I understand completely what
>> you want to achieve. Isn't it the same as having a no_right_turn for
>> BED and a no_right_turn for FEB?
>>   
>>     
> Not, because if you come from X, BED is allowed, and if you come from G,
> EBC is also allowed. I don't know if XBEG exists in Pauls cases, but I
> have one like this in my city.
> Cheers
> Carlos
Well, my ascii art is not so good ;-) . X should be on top of B.