[Tagging] small change to turn restriction relation tagging

[Pieren]

On Wed, Apr 23, 2014 at 4:37 PM, Richard Welty <rwelty at averillpark.net> wrote:

> the signage in some other states in the US for restricted U-turns has
> an explicit authorization posted at each U-turn. i honestly don't
> have a feeling for how general the notion that emergency vehicles
> can ignore all access restrictions really is.

I think the tag makes sens only where a specific road sign exists.
This is the case in my country (not U-turns but service roads or even
pedestrian streets with e.g. special removable bollards)

Pieren