mini roundaboutn.
/ˌmɪnɪˈraʊndəbaʊt/, U.S. /ˌmɪniˈraʊndəˌbaʊt/ Originally and chiefly British.
A small traffic roundabout, esp. one indicated by a very low island or by road markings alone.
ΚΠ
1973 Municipal Engin. 8 June 1345/1 The term ‘mini roundabout’ has come to refer to a junction where the central island diameter is no bigger than a third of the diameter of the inscribed circle [Note] within the kerblines surrounding the junction.
1987 Financial Times 25 July (Weekend section) p. xiv Right at the first roundabout (near Town Hall and Bishop's Palace) and right at next mini-roundabout.
2000 Courier (Dundee) (Electronic ed.) 28 July The car clipped a mini roundabout and a traffic island and struck the bollard.
This is a new entry (OED Third Edition, March 2002; most recently modified version published online March 2022).
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n.1973