diff --git a/ontology/saref4auto.ttl b/ontology/saref4auto.ttl
index 6c42a2974ab8a5501672e2c6de51040684721a0d..02d60fbeb14dc667991904528a3046acdf7f6623 100644
--- a/ontology/saref4auto.ttl
+++ b/ontology/saref4auto.ttl
@@ -684,15 +684,15 @@ vann:preferredNamespaceUri rdf:type owl:AnnotationProperty .
                        rdfs:subClassOf saref:Device ,
                                        s4syst:System ,
                                        [ rdf:type owl:Restriction ;
-                                         owl:onProperty saref:measuresProperty ;
+                                         owl:onProperty saref:observes ;
                                          owl:someValuesFrom :Acceleration
                                        ] ,
                                        [ rdf:type owl:Restriction ;
-                                         owl:onProperty saref:measuresProperty ;
+                                         owl:onProperty saref:observes ;
                                          owl:someValuesFrom :Heading
                                        ] ,
                                        [ rdf:type owl:Restriction ;
-                                         owl:onProperty saref:measuresProperty ;
+                                         owl:onProperty saref:observes ;
                                          owl:someValuesFrom :Speed
                                        ] ,
                                        [ rdf:type owl:Restriction ;
@@ -1218,23 +1218,23 @@ vann:preferredNamespaceUri rdf:type owl:AnnotationProperty .
 :RoadSideSensor rdf:type owl:Class ;
                 rdfs:subClassOf saref:Sensor ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Heading
                                 ] ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Height
                                 ] ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Length
                                 ] ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Speed
                                 ] ,
                                 [ rdf:type owl:Restriction ;
-                                  owl:onProperty saref:measuresProperty ;
+                                  owl:onProperty saref:observes ;
                                   owl:someValuesFrom :Width
                                 ] ,
                                 [ rdf:type owl:Restriction ;