[Talk-us] Does only_straight_on imply no_u_turn?

Alan Mintz Alan_Mintz+OSM at Earthlink.Net
Fri Jan 8 11:17:44 GMT 2010

When tagging a T-shaped intersection like this:


if you tag a no_left_turn restriction from A into B, it renders (in JOSM 
anyway) as an arrow going straight and right. This doesn't make sense in 
these T-intersection cases because there is no road continuing right from 
the intersection. So, I've been tagging these as only_straight_on instead, 
which effectively is the same thing, but renders better (though not the 
same as the sign).

However, in tagging a no-left/no-U at such an intersection, I realize that 
"only_straight_on" might also imply no_u_turn, in which case most of my 
previous tagging in the case above is wrong, since most of them were 
no-left-turn signs only (i.e. U-turns are allowed).

Does only_straight_on imply no_u_turn (in addition to meaning no left and 
no right)? If so, does it make more sense to render no_left_turn as a 
left-turning arrow with a line through it, instead of the current 
straight+right arrow?

Alan Mintz <Alan_Mintz+OSM at Earthlink.net>

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