diff --git a/drc/DRCbasic.c b/drc/DRCbasic.c
index 5b57439a..3e23ab3d 100644
--- a/drc/DRCbasic.c
+++ b/drc/DRCbasic.c
@@ -646,7 +646,11 @@ drcTile (tile, arg)
 	    for (cptr = DRCCurStyle->DRCRulesTbl[to][tt]; cptr != (DRCCookie *) NULL;
 			cptr = cptr->drcc_next)
 	    {
-		if (cptr->drcc_flags & DRC_ANGLES_90) continue;
+	    	/* DRC_ANGLES_90 and DRC_SPLITTILE rules are handled by	*/
+		/* the code above for non-Manhattan shapes and do not	*/
+		/* need to be processed again.				*/
+		if (cptr->drcc_flags & (DRC_ANGLES_90 | DRC_SPLITTILE))
+		    continue;
 
 		/* Find the rule distances according to the scale factor */
 		dist = cptr->drcc_dist;
@@ -1044,7 +1048,11 @@ drcTile (tile, arg)
 	    for (cptr = DRCCurStyle->DRCRulesTbl[to][tt]; cptr != (DRCCookie *) NULL;
 				cptr = cptr->drcc_next)
 	    {
-		if (cptr->drcc_flags & DRC_ANGLES_90) continue;
+	    	/* DRC_ANGLES_90 and DRC_SPLITTILE rules are handled by	*/
+		/* the code above for non-Manhattan shapes and do not	*/
+		/* need to be processed again.				*/
+		if (cptr->drcc_flags & (DRC_ANGLES_90 | DRC_SPLITTILE))
+		    continue;
 
 		/* Find the rule distances according to the scale factor */
 		dist = cptr->drcc_dist;
diff --git a/drc/DRCtech.c b/drc/DRCtech.c
index 2fdb4b08..36982a86 100644
--- a/drc/DRCtech.c
+++ b/drc/DRCtech.c
@@ -1290,13 +1290,6 @@ drcExtend(argc, argv)
  *
  *	width poly,pmc 2 "poly width must be at least 2"
  *
- * Optional "from layers2" is useful when defining a device width;
- * effectively, it represents an overhang rule where the presence of
- * the overhanging material is optional.  The equivalent rule is:
- *
- *	edge4way layers2 layers distance layers 0 0 why
- *
- *
  * Results:
  *	Returns distance.
  *
@@ -1354,6 +1347,26 @@ drcWidth(argc, argv)
 				why, distance, DRC_FORWARD, plane, plane);
 		    dp->drcc_next = dpnew;
 		}
+
+		/* Width checks are symmetric and so need to be checked	*/
+		/* in only one direction.  However, split tiles are	*/
+		/* not symmetric, so apply the reverse case with a flag	*/
+		/* that will allow the rule to be applied only in the	*/
+		/* case of a split tile.				*/
+
+		if (TTMaskHasType(&set, i) && TTMaskHasType(&setC, j))
+		{
+		    plane = LowestMaskBit(pset);
+
+		    /* Find bucket preceding the new one we wish to insert */
+		    dp = drcFindBucket(i, j, distance);
+		    dpnew = (DRCCookie *)mallocMagic(sizeof (DRCCookie));
+		    drcAssign(dpnew, distance, dp->drcc_next, &set, &set,
+				why, distance, DRC_REVERSE | DRC_SPLITTILE,
+				plane, plane);
+		    dp->drcc_next = dpnew;
+		}
+
 	    }
 	}
     }
diff --git a/drc/drc.h b/drc/drc.h
index f3e8fe90..d7d8428e 100644
--- a/drc/drc.h
+++ b/drc/drc.h
@@ -64,24 +64,25 @@ typedef struct drccookie
  * edge processing.
  */
 
-#define		DRC_FORWARD		0x000
-#define		DRC_REVERSE		0x001
-#define		DRC_BOTHCORNERS		0x002
-#define		DRC_TRIGGER		0x004
-#define		DRC_BENDS		0x008
-#define		DRC_OUTSIDE		0x010
-#define		DRC_AREA		0x020
-#define		DRC_OFFGRID		0x040
-#define		DRC_MAXWIDTH		0x080
-#define		DRC_MAXWIDTH_BOTH       0x100
-#define		DRC_RECTSIZE		0x200
-#define		DRC_ANGLES_45		0x400
-#define		DRC_ANGLES_90		0x800
+#define		DRC_FORWARD		0x0000
+#define		DRC_REVERSE		0x0001
+#define		DRC_BOTHCORNERS		0x0002
+#define		DRC_TRIGGER		0x0004
+#define		DRC_BENDS		0x0008
+#define		DRC_OUTSIDE		0x0010
+#define		DRC_AREA		0x0020
+#define		DRC_OFFGRID		0x0040
+#define		DRC_MAXWIDTH		0x0080
+#define		DRC_MAXWIDTH_BOTH       0x0100
+#define		DRC_RECTSIZE		0x0200
+#define		DRC_ANGLES_45		0x0400
+#define		DRC_ANGLES_90		0x0800
+#define		DRC_SPLITTILE		0x1000
 #define 	DRC_NONSTANDARD		(DRC_AREA|DRC_MAXWIDTH|DRC_RECTSIZE\
 					 |DRC_ANGLES_90|DRC_OFFGRID)
 
 /* More flags for indicating what the rule type represents */
-#define		DRC_CIFRULE		0x400
+#define		DRC_CIFRULE		0x2000
 
 #define	DRC_PENDING			0
 #define DRC_UNPROCESSED 		CLIENTDEFAULT