MDU has an -E shape, the single - is towards DG, while the three arms of E are to MNM, MEJ and BDNK. Even Salem Jn is -E. The single - is towards MGSJ, while the three arms of E are to ED, KRR and VRI. Similar case is for DG. The single - is towards MDU, while the three arms of E are to POY, TPJ and KRR. Infact MDU and DG are two such junctions lying back-to-back!