a road junction (= where roads come together) consisting of a main road that goes through the middle of a roundabout (= a junction where traffic must go around a circular area in the middle)

A throughabout is a variant of the signalized roundabout. 贯通式环岛是红绿灯环岛的一种变体。

Work to convert a controversial throughabout junction into a conventional roundabout will begin later this year. 把一个有争议的贯通式环岛改造成传统环岛的工程将在今年晚些时候开始。

Synonym: hamburger (ON ROAD)