Echelon Interchange
For an echelon interchange, one approach on both the arterial and intersecting cross streets is structurally elevated as the cross streets intersect while the other approach halves on both the arterial and intersecting cross streets intersect at-grade as depicted in figure 205. Typical movements on an echelon interchange are shown in figure 206. The result is a symmetrical but offset pair of two-phase intersections separated by grade, both operated by two-phase signals as in the meeting of two one-way streets. The elevation is provided with the help of retaining wall structures. With the elevation of two of the approaches, the intersections can be operated with two-phase signals.
