It depends on whether those tags would be based on some objective, [verifiable][1] criteria, or just your opinion. Are these roads signposted in some way, or otherwise designated by a local authority as only being suitable for high ground clearance/4wd vehicles, or do you just think they are. The existing [`4wd_only=*`][2] tag can should be used for roads that have been signposted that way, but not for roads where you're effectively you just asserting your opinion. The reason for this is that think you should use a 4wd. If another mapper may come comes along at a different time and think thinks the road *doesn't* need a 4wd vehicle. The vehicle, the only way to resolve such a disagreement is to rely on what's "on the ground", so we need a sign present to use this tag. [1]: http://wiki.openstreetmap.org/wiki/Verifiability [2]: http://wiki.openstreetmap.org/wiki/Tag:4wd_only%3Dyes

It depends on whether those tags would be based on some objective, [verifiable][1] criteria, or just your opinion. Are these roads signposted in some way, or otherwise designated by a local authority as only being suitable for high ground clearance/4wd vehicles, or do you just think they are. The existing [`4wd_only=*`][2] tag can be used for roads that have been signposted that way, but not for roads where you're effectively just asserting your opinion. The reason for this is that another mapper may come along at a different time and think the road *doesn't* need a 4wd vehicle. The only way to resolve such a disagreement is to rely on what's "on the ground", so we need a sign present to use this tag. [1]: http://wiki.openstreetmap.org/wiki/Verifiability [2]: http://wiki.openstreetmap.org/wiki/Tag:4wd_only%3Dyes