Some comments on this subject. *Comment on the situation in the UK:*
Mini-roundabouts often, but not always have the specific road sign 611.1 <https://commons.wikimedia.org/wiki/File:UK_traffic_sign_611.1.svg> Mini-roundabouts are nearly always physically small. Mini-roundabouts are not the equivalent of a three/four-way stop (which you find in the US, and which I found very useful and efficient traffic calming system with the added benefit of forced education to fair-play). Mini-roundabouts, if at all, can be modelled as all-way give-way junction, but with the *priority to the right* (which is difficult to model in OSM). In addition there is a kind of turning circle in the middle, albeit of limited dimensions, but turning is discouraged. *Comment on the situation in Italy* Roundabouts in Italy exist in both forms: "normal" roundabout and "mini" roundabout, but there are no legal distinctions. Both are called the same ("rotatoria" officially and “rotonda” in everyday-Italian) and they both have the same road signals, including explicit give-way signs and road markings (exceptionally also stop signs) on the incoming arms. The only difference is that "mini" roundabouts do have traversable centres. I am not aware of U-turn restrictions or recommendations (like in the UK), but size matters, obviously. Small “mini” roundabouts have a similar effect as mini-roundabouts in the UK, i.e. they are normal junctions with the *priority to the left *(example <https://www.mapillary.com/map/im/C0B8YSJXJu1v8UxAaG8nmA>) Larger “mini” roundabouts exist and they can be bigger than the ones I have seen in the UK. Around here there are a number of fairly large "mini" roundabouts (example <https://www.mapillary.com/map/im/CujlO1raDC7I_uA_LeRrEA>) *General comment on the subject of the discussion* I would strongly advice against anything like deprecating the mini-roundabout tag. What could be interesting, is to improve the tagging to make it usable for lorry (truck) routing, but for that we need to make sure that we discuss with makerr of lorry routing. Two possibilities spring to (my limited) mind: 1. on normal raoundabouts, tag the width of the roadway. Assuming the OSM way is exactly in the middle of the roadway, this allows some reckoning of the likelihood of a lorry with given dimensions and steering characteristics passing the roundabout. 2. for mini-roundabouts this seems easier: just add an additional tag to the mini_roundabout with the diameter or the radius of the largest circle that fits into the shape of the roundabout (attention: the existing tag diameter is in mm)
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