订阅以下载
Semi-directional T

Like a directional T interchange, a semi-directional T interchange uses flyover/under ramps in all directions at a three-way interchange. However in a semi-directional T some of the splits and merges are switched to avoid ramps to and from the passing lanes, eliminating the major disadvantage of the directional T. Semi-directional T interchanges are generally safe and efficient, though being three-level interchanges they do require more land and cost more than trumpets

- From Wikipedia