Index: /applications/editors/josm/plugins/simplifyarea/src/sk/zdila/josm/plugin/simplify/SimplifyAreaAction.java
===================================================================
--- /applications/editors/josm/plugins/simplifyarea/src/sk/zdila/josm/plugin/simplify/SimplifyAreaAction.java	(revision 23488)
+++ /applications/editors/josm/plugins/simplifyarea/src/sk/zdila/josm/plugin/simplify/SimplifyAreaAction.java	(revision 23489)
@@ -235,5 +235,5 @@
                 		computeConvectAngle(coord1, coord2, coord3) > angleThreshold ||
                         computeArea(coord1, coord2, coord3) > areaThreshold ||
-                        crossTrackError(coord1, coord2, coord3) > distanceThreshold) {
+                        Math.abs(crossTrackError(coord1, coord2, coord3)) > distanceThreshold) {
                     newNodes2.add(prevNode);
                 	System.out.println(" ... KEEP");