[OSM-talk] [Tagging] Feature Proposal - RFC - Explicit 4WD_Only tag

[Matt White]

Introduce a tag that allows ways to indicate explicitly whether a 4WD 
vehicle is required to navigate that way. This would also allow routing 
engines to take into account such ways, so that non-4WD vehicles aren't 
routed onto roads they aren't capable of.

Please see the proposal page for the details

http://wiki.openstreetmap.org/wiki/Proposed_features/4WD_Only

Matt