Can anyone give a suggestion for how to tag a turning restriction that only 
applies to long vehicles?

The basic tags I understand:
                restriction = no_left_turn
                type = restriction

I have added this exception from the turn restrictions plugin:
                except = bicycle;motorcar
however, this doesn’t really encode what I want - vehicles over 19 metres 
prevented from turning.

would this (not really suitable) tag work? 
                minlength = 19 (it’s not on the page 
http://wiki.openstreetmap.org/wiki/Relation:restriction

I have considered
                except = maxlength=19
however it’s not a standard format, and routers would probably have trouble 
interpreting the tag

I could use:
                restriction:hgv = no_left_turn
however there are heavy goods vehicles shorter than 19 metres who are allowed 
to make the turn.

Mark P.


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