diff --git a/src/main/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlExtractionService.java b/src/main/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlExtractionService.java
index 3b18e70..23a5c0c 100644
--- a/src/main/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlExtractionService.java
+++ b/src/main/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlExtractionService.java
@@ -12,6 +12,8 @@ import at.procon.eventhub.tachographfilesession.model.ExtractionWarning;
 import at.procon.eventhub.tachographfilesession.model.TachographFileSession;
 import at.procon.eventhub.tachographfilesession.model.TachographFileSessionMetadata;
 import java.time.Instant;
+import java.time.LocalDate;
+import java.time.LocalTime;
 import java.time.OffsetDateTime;
 import java.time.ZoneOffset;
 import java.util.ArrayList;
@@ -19,6 +21,7 @@ import java.util.Comparator;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.TreeSet;
 import java.util.UUID;
 import javax.xml.xpath.XPath;
 import javax.xml.xpath.XPathConstants;
@@ -51,14 +54,7 @@ public class VehicleUnitXmlExtractionService {
 
         VehicleContext vehicleContext = extractVehicleContext(document, sessionWarnings);
         Map<String, DriverExtractionBuilder> driversByKey = new LinkedHashMap<>();
-
-        if (nodes(document, "/VehicleUnit/Activities/vuActivityDailyData").getLength() > 0) {
-            sessionWarnings.add(new ExtractionWarning(
-                    "VU_ACTIVITY_NOT_EXTRACTED",
-                    "Vehicle-unit daily activity data is present but is not yet mapped into card activity intervals in this phase.",
-                    "/VehicleUnit/Activities/vuActivityDailyData"
-            ));
-        }
+        List<VuCardIwInterval> vuCardIwIntervals = new ArrayList<>();
 
         NodeList records = nodes(document, "/VehicleUnit/Activities/vuCardIWData/vuCardIWRecords");
         for (int i = 0; i < records.getLength(); i++) {
@@ -135,6 +131,13 @@ public class VehicleUnitXmlExtractionService {
                     vehicleContext.vehicle() == null ? null : vehicleContext.vehicle().vehicleKey(),
                     path
             ));
+            vuCardIwIntervals.add(new VuCardIwInterval(
+                    driverKey,
+                    normalizeToken(text(record, "cardSlotNumber")),
+                    from,
+                    to,
+                    path
+            ));
         }
 
         if (driversByKey.isEmpty()) {
@@ -145,6 +148,9 @@ public class VehicleUnitXmlExtractionService {
             ));
         }
 
+        List<ExtractedCardActivityInterval> vuActivityIntervals = extractActivityIntervals(document, vehicleContext, sessionWarnings);
+        assignActivityCoverage(vuActivityIntervals, vuCardIwIntervals, vehicleContext, driversByKey, sessionWarnings);
+
         List<ExtractionWarning> allWarnings = new ArrayList<>(sessionWarnings);
         Map<String, DriverExtractionSession> driverSessions = new LinkedHashMap<>();
         int activityCount = 0;
@@ -187,7 +193,7 @@ public class VehicleUnitXmlExtractionService {
                     "Vehicle-unit XML does not contain an Overview block.",
                     "/VehicleUnit"
             ));
-            return new VehicleContext(null, null, null);
+            return new VehicleContext(null, null, null, null);
         }
 
         String registrationNation = text(overview, "vehicleRegistrationIdentification/vehicleRegistrationNation");
@@ -217,7 +223,210 @@ public class VehicleUnitXmlExtractionService {
         }
 
         OffsetDateTime defaultEnd = offsetDateTime(text(overview, "vuDownloadablePeriod/maxDownloadableTime"));
-        return new VehicleContext(registration, vehicle, defaultEnd);
+        OffsetDateTime defaultStart = offsetDateTime(text(overview, "vuDownloadablePeriod/minDownloadableTime"));
+        return new VehicleContext(registration, vehicle, defaultStart, defaultEnd);
+    }
+
+    private List<ExtractedCardActivityInterval> extractActivityIntervals(
+            Document document,
+            VehicleContext vehicleContext,
+            List<ExtractionWarning> warnings
+    ) {
+        NodeList dayRecords = nodes(document, "/VehicleUnit/Activities/vuActivityDailyData");
+        if (dayRecords.getLength() == 0) {
+            return List.of();
+        }
+
+        LocalDate startDate = vehicleContext.defaultActivityStartDate();
+        if (startDate == null) {
+            warnings.add(new ExtractionWarning(
+                    "VU_ACTIVITY_DATE_INFERENCE_FAILED",
+                    "Vehicle-unit activity daily data is present but no base date could be inferred from the VU downloadable period.",
+                    "/VehicleUnit/Activities/vuActivityDailyData"
+            ));
+            return List.of();
+        }
+
+        LocalDate maxDate = vehicleContext.defaultActivityEndDate();
+        if (maxDate != null) {
+            LocalDate inferredEndDate = startDate.plusDays(dayRecords.getLength() - 1L);
+            if (inferredEndDate.isAfter(maxDate)) {
+                warnings.add(new ExtractionWarning(
+                        "VU_ACTIVITY_DATE_INFERENCE_RANGE",
+                        "Vehicle-unit activity daily records exceed the VU downloadable-period range when mapped by sequence order.",
+                        "/VehicleUnit/Activities/vuActivityDailyData"
+                ));
+            }
+        }
+
+        List<ExtractedCardActivityInterval> intervals = new ArrayList<>();
+        int intervalNo = 0;
+        for (int dayIndex = 0; dayIndex < dayRecords.getLength(); dayIndex++) {
+            Element dayRecord = (Element) dayRecords.item(dayIndex);
+            LocalDate date = startDate.plusDays(dayIndex);
+            String dayPath = "/VehicleUnit/Activities[" + (dayIndex + 1) + "]/vuActivityDailyData";
+            NodeList changes = nodes(dayRecord, "activityChangeInfos");
+            List<ActivityChange> parsedChanges = new ArrayList<>();
+            for (int changeIndex = 0; changeIndex < changes.getLength(); changeIndex++) {
+                Element change = (Element) changes.item(changeIndex);
+                OffsetDateTime from = combine(date, text(change, "timeOfChange"));
+                if (from == null) {
+                    warnings.add(new ExtractionWarning(
+                            "INVALID_VU_ACTIVITY_CHANGE_TIME",
+                            "Vehicle-unit activity change has invalid timeOfChange.",
+                            dayPath + "/activityChangeInfos[" + (changeIndex + 1) + "]"
+                    ));
+                    continue;
+                }
+                parsedChanges.add(new ActivityChange(
+                        from,
+                        normalizeActivity(text(change, "activity")),
+                        normalizeToken(text(change, "slot")),
+                        normalizeToken(text(change, "cardStatus")),
+                        normalizeToken(text(change, "drivingStatus")),
+                        dayPath + "/activityChangeInfos[" + (changeIndex + 1) + "]"
+                ));
+            }
+            parsedChanges.sort(Comparator.comparing(ActivityChange::from));
+            for (int i = 0; i < parsedChanges.size(); i++) {
+                ActivityChange current = parsedChanges.get(i);
+                OffsetDateTime to = i + 1 < parsedChanges.size()
+                        ? parsedChanges.get(i + 1).from()
+                        : date.plusDays(1).atStartOfDay().atOffset(ZoneOffset.UTC);
+                if (!current.from().isBefore(to)) {
+                    continue;
+                }
+                intervalNo++;
+                intervals.add(new ExtractedCardActivityInterval(
+                        "VUACT-" + intervalNo,
+                        current.from(),
+                        to,
+                        current.activityType(),
+                        current.slot(),
+                        current.cardStatus(),
+                        current.drivingStatus(),
+                        null,
+                        null,
+                        current.rawRecordPath()
+                ));
+            }
+        }
+
+        intervals.sort(Comparator.comparing(ExtractedCardActivityInterval::from));
+        return intervals;
+    }
+
+    private void assignActivityCoverage(
+            List<ExtractedCardActivityInterval> vuActivityIntervals,
+            List<VuCardIwInterval> vuCardIwIntervals,
+            VehicleContext vehicleContext,
+            Map<String, DriverExtractionBuilder> driversByKey,
+            List<ExtractionWarning> warnings
+    ) {
+        for (ExtractedCardActivityInterval interval : vuActivityIntervals) {
+            List<ActivitySegment> segments = splitByDriverCoverage(interval, vuCardIwIntervals);
+            if (segments.isEmpty()) {
+                warnings.add(new ExtractionWarning(
+                        "VU_ACTIVITY_UNASSIGNED",
+                        "Vehicle-unit activity interval could not be assigned to a driver-card insertion/withdrawal interval.",
+                        interval.rawRecordPath()
+                ));
+                continue;
+            }
+            if (isPartiallyCovered(interval, segments)) {
+                warnings.add(new ExtractionWarning(
+                        "VU_ACTIVITY_UNASSIGNED",
+                        "Vehicle-unit activity interval could only be partially assigned to driver-card insertion/withdrawal intervals.",
+                        interval.rawRecordPath()
+                ));
+            }
+
+            for (int i = 0; i < segments.size(); i++) {
+                ActivitySegment segment = segments.get(i);
+                DriverExtractionBuilder builder = driversByKey.get(segment.driverKey());
+                if (builder == null) {
+                    warnings.add(new ExtractionWarning(
+                            "VU_ACTIVITY_DRIVER_MISSING",
+                            "Vehicle-unit activity interval matched a driver key without an initialized driver session.",
+                            interval.rawRecordPath()
+                    ));
+                    continue;
+                }
+                String intervalId = segments.size() == 1 ? interval.intervalId() : interval.intervalId() + "-" + (i + 1);
+                builder.cardActivityIntervals.add(new ExtractedCardActivityInterval(
+                        intervalId,
+                        segment.from(),
+                        segment.to(),
+                        interval.activityType(),
+                        interval.slot(),
+                        interval.cardStatus(),
+                        interval.drivingStatus(),
+                        vehicleContext.registration() == null ? null : vehicleContext.registration().registrationKey(),
+                        vehicleContext.vehicle() == null ? null : vehicleContext.vehicle().vehicleKey(),
+                        interval.rawRecordPath()
+                ));
+            }
+        }
+    }
+
+    private boolean isPartiallyCovered(ExtractedCardActivityInterval interval, List<ActivitySegment> segments) {
+        if (segments.isEmpty()) {
+            return true;
+        }
+        if (!segments.get(0).from().equals(interval.from())) {
+            return true;
+        }
+        if (!segments.get(segments.size() - 1).to().equals(interval.to())) {
+            return true;
+        }
+        for (int i = 1; i < segments.size(); i++) {
+            if (!segments.get(i - 1).to().equals(segments.get(i).from())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private List<ActivitySegment> splitByDriverCoverage(
+            ExtractedCardActivityInterval interval,
+            List<VuCardIwInterval> vuCardIwIntervals
+    ) {
+        TreeSet<OffsetDateTime> cutPoints = new TreeSet<>();
+        cutPoints.add(interval.from());
+        cutPoints.add(interval.to());
+
+        List<VuCardIwInterval> matchingIntervals = vuCardIwIntervals.stream()
+                .filter(iw -> iw.slot() == null || interval.slot() == null || iw.slot().equals(interval.slot()))
+                .filter(iw -> iw.overlaps(interval.from(), interval.to()))
+                .toList();
+
+        for (VuCardIwInterval iw : matchingIntervals) {
+            if (iw.from().isAfter(interval.from()) && iw.from().isBefore(interval.to())) {
+                cutPoints.add(iw.from());
+            }
+            OffsetDateTime iwEndExclusive = iw.endExclusive();
+            if (iwEndExclusive.isAfter(interval.from()) && iwEndExclusive.isBefore(interval.to())) {
+                cutPoints.add(iwEndExclusive);
+            }
+        }
+
+        List<OffsetDateTime> orderedCutPoints = List.copyOf(cutPoints);
+        List<ActivitySegment> segments = new ArrayList<>();
+        for (int i = 0; i < orderedCutPoints.size() - 1; i++) {
+            OffsetDateTime segmentFrom = orderedCutPoints.get(i);
+            OffsetDateTime segmentTo = orderedCutPoints.get(i + 1);
+            if (!segmentFrom.isBefore(segmentTo)) {
+                continue;
+            }
+            VuCardIwInterval covering = matchingIntervals.stream()
+                    .filter(iw -> iw.covers(segmentFrom))
+                    .findFirst()
+                    .orElse(null);
+            if (covering != null) {
+                segments.add(new ActivitySegment(covering.driverKey(), segmentFrom, segmentTo));
+            }
+        }
+        return segments;
     }
 
     private Element firstElement(Object node, String expression) {
@@ -261,6 +470,35 @@ public class VehicleUnitXmlExtractionService {
         return Long.parseLong(value.trim());
     }
 
+    private OffsetDateTime combine(LocalDate date, String timeText) {
+        if (date == null || timeText == null || timeText.isBlank()) {
+            return null;
+        }
+        LocalTime time = java.time.OffsetTime.parse(timeText.trim()).withOffsetSameInstant(ZoneOffset.UTC).toLocalTime();
+        return date.atTime(time).atOffset(ZoneOffset.UTC);
+    }
+
+    private String normalizeActivity(String value) {
+        String normalized = normalizeToken(value);
+        if (normalized == null) {
+            return "UNKNOWN_ACTIVITY";
+        }
+        return switch (normalized) {
+            case "DRIVING", "DRIVE" -> "DRIVE";
+            case "WORK" -> "WORK";
+            case "AVAILABILITY", "AVAILABLE" -> "AVAILABILITY";
+            case "BREAK_REST", "BREAK/REST", "REST" -> "BREAK_REST";
+            default -> "UNKNOWN_ACTIVITY";
+        };
+    }
+
+    private String normalizeToken(String value) {
+        if (value == null || value.isBlank()) {
+            return null;
+        }
+        return value.trim().toUpperCase().replace('-', '_').replace(' ', '_');
+    }
+
     private String joinCardNumber(Element node, String basePath) {
         String driverIdentification = text(node, basePath + "/driverIdentification");
         if (driverIdentification == null) {
@@ -358,7 +596,52 @@ public class VehicleUnitXmlExtractionService {
     private record VehicleContext(
             ExtractedVehicleRegistration registration,
             ExtractedVehicle vehicle,
+            OffsetDateTime defaultActivityStart,
             OffsetDateTime defaultOpenIntervalEnd
+    ) {
+        private LocalDate defaultActivityStartDate() {
+            return defaultActivityStart == null ? null : defaultActivityStart.withOffsetSameInstant(ZoneOffset.UTC).toLocalDate();
+        }
+
+        private LocalDate defaultActivityEndDate() {
+            return defaultOpenIntervalEnd == null ? null : defaultOpenIntervalEnd.withOffsetSameInstant(ZoneOffset.UTC).toLocalDate();
+        }
+    }
+
+    private record ActivityChange(
+            OffsetDateTime from,
+            String activityType,
+            String slot,
+            String cardStatus,
+            String drivingStatus,
+            String rawRecordPath
+    ) {
+    }
+
+    private record VuCardIwInterval(
+            String driverKey,
+            String slot,
+            OffsetDateTime from,
+            OffsetDateTime to,
+            String rawRecordPath
+    ) {
+        private OffsetDateTime endExclusive() {
+            return to.plusSeconds(1);
+        }
+
+        private boolean covers(OffsetDateTime timestamp) {
+            return !from.isAfter(timestamp) && timestamp.isBefore(endExclusive());
+        }
+
+        private boolean overlaps(OffsetDateTime rangeStart, OffsetDateTime rangeEnd) {
+            return endExclusive().isAfter(rangeStart) && from.isBefore(rangeEnd);
+        }
+    }
+
+    private record ActivitySegment(
+            String driverKey,
+            OffsetDateTime from,
+            OffsetDateTime to
     ) {
     }
 }
diff --git a/src/test/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlExtractionServiceTest.java b/src/test/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlExtractionServiceTest.java
index a2544e4..7e57faf 100644
--- a/src/test/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlExtractionServiceTest.java
+++ b/src/test/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlExtractionServiceTest.java
@@ -52,12 +52,19 @@ class VehicleUnitXmlExtractionServiceTest {
         assertThat(firstDriver.cardVehicleUsageIntervals()).hasSize(1);
         assertThat(firstDriver.cardVehicleUsageIntervals().get(0).from().toString()).isEqualTo("2026-04-01T08:00Z");
         assertThat(firstDriver.cardVehicleUsageIntervals().get(0).to().toString()).isEqualTo("2026-04-01T11:00Z");
+        assertThat(firstDriver.cardActivityIntervals()).hasSize(3);
+        assertThat(firstDriver.cardActivityIntervals().get(0).activityType()).isEqualTo("WORK");
+        assertThat(firstDriver.cardActivityIntervals().get(1).activityType()).isEqualTo("DRIVE");
+        assertThat(firstDriver.cardActivityIntervals().get(2).to().toString()).isEqualTo("2026-04-01T11:00:01Z");
 
         assertThat(secondDriver.cardVehicleUsageIntervals()).hasSize(1);
         assertThat(secondDriver.cardVehicleUsageIntervals().get(0).to().toString()).isEqualTo("2026-04-02T10:00Z");
+        assertThat(secondDriver.cardActivityIntervals()).hasSize(2);
+        assertThat(secondDriver.cardActivityIntervals().get(0).from().toString()).isEqualTo("2026-04-02T07:30Z");
+        assertThat(secondDriver.cardActivityIntervals().get(1).to().toString()).isEqualTo("2026-04-02T10:00:01Z");
 
         assertThat(session.warnings()).extracting("code")
-                .contains("VU_ACTIVITY_NOT_EXTRACTED", "OPEN_VU_CARD_INTERVAL");
+                .contains("OPEN_VU_CARD_INTERVAL", "VU_ACTIVITY_UNASSIGNED");
     }
 
     private Document document(String xml) throws Exception {
diff --git a/src/test/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlSamples.java b/src/test/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlSamples.java
index fd56887..cfe92b1 100644
--- a/src/test/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlSamples.java
+++ b/src/test/java/at/procon/eventhub/tachographfilesession/service/VehicleUnitXmlSamples.java
@@ -15,6 +15,7 @@ final class VehicleUnitXmlSamples {
                       <vehicleRegistrationNumber><vehicleRegNumber>W-1000V</vehicleRegNumber></vehicleRegistrationNumber>
                     </vehicleRegistrationIdentification>
                     <vuDownloadablePeriod>
+                      <minDownloadableTime>2026-04-01T00:00:00Z</minDownloadableTime>
                       <maxDownloadableTime>2026-04-02T10:00:00Z</maxDownloadableTime>
                     </vuDownloadablePeriod>
                   </Overview>
@@ -64,7 +65,49 @@ final class VehicleUnitXmlSamples {
                         <manualInputFlag>MANUAL_ENTRIES</manualInputFlag>
                       </vuCardIWRecords>
                     </vuCardIWData>
-                    <vuActivityDailyData/>
+                    <vuActivityDailyData>
+                      <noOfActivityChanges>3</noOfActivityChanges>
+                      <activityChangeInfos>
+                        <slot>DRIVER</slot>
+                        <drivingStatus>SINGLE</drivingStatus>
+                        <cardStatus>INSERTED</cardStatus>
+                        <activity>WORK</activity>
+                        <timeOfChange>08:00:00Z</timeOfChange>
+                      </activityChangeInfos>
+                      <activityChangeInfos>
+                        <slot>DRIVER</slot>
+                        <drivingStatus>SINGLE</drivingStatus>
+                        <cardStatus>INSERTED</cardStatus>
+                        <activity>DRIVING</activity>
+                        <timeOfChange>09:00:00Z</timeOfChange>
+                      </activityChangeInfos>
+                      <activityChangeInfos>
+                        <slot>DRIVER</slot>
+                        <drivingStatus>SINGLE</drivingStatus>
+                        <cardStatus>INSERTED</cardStatus>
+                        <activity>BREAK/REST</activity>
+                        <timeOfChange>11:00:00Z</timeOfChange>
+                      </activityChangeInfos>
+                    </vuActivityDailyData>
+                  </Activities>
+                  <Activities>
+                    <vuActivityDailyData>
+                      <noOfActivityChanges>2</noOfActivityChanges>
+                      <activityChangeInfos>
+                        <slot>DRIVER</slot>
+                        <drivingStatus>SINGLE</drivingStatus>
+                        <cardStatus>INSERTED</cardStatus>
+                        <activity>WORK</activity>
+                        <timeOfChange>07:30:00Z</timeOfChange>
+                      </activityChangeInfos>
+                      <activityChangeInfos>
+                        <slot>DRIVER</slot>
+                        <drivingStatus>SINGLE</drivingStatus>
+                        <cardStatus>INSERTED</cardStatus>
+                        <activity>DRIVING</activity>
+                        <timeOfChange>08:00:00Z</timeOfChange>
+                      </activityChangeInfos>
+                    </vuActivityDailyData>
                   </Activities>
                 </VehicleUnit>
                 """;