You could try using a [roadAccess relation][1] although I'm not sure how many routing applications are aware of them. them, as there [aren't many in use][2]. [1]: http://wiki.openstreetmap.org/wiki/Karlsruhe_Schema#Giving_hints_about_the_road-access_.28optional.29 [2]: http://www.openstreetmap.org/relation/270881http://taginfo.openstreetmap.org/relations/roadAccess

You could try using a [roadAccess relation][1] although I'm not sure how many routing applications are aware of them. [1]: http://wiki.openstreetmap.org/wiki/Karlsruhe_Schema#Giving_hints_about_the_road-access_.28optional.29 [2]: http://www.openstreetmap.org/relation/270881