[OSM-talk] Turn restrictions vs allowances?

[Matias D'Ambrosio]

 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. Without a "turning left allowed" relation, a "restriction no 
left turn" relation is needed on each intersection of every two way road 
(twice, one for each direction of driving?), isn't it?
 Hopefully I'm missing something :-)