diff --git a/.github/workflows/sync-cloud-run-env.yml b/.github/workflows/sync-cloud-run-env.yml
index e2dd038..3e5528f 100644
--- a/.github/workflows/sync-cloud-run-env.yml
+++ b/.github/workflows/sync-cloud-run-env.yml
@@ -153,9 +153,32 @@ concurrency:
   cancel-in-progress: false
 
 jobs:
+  approve-live-traffic:
+    name: Approve LongBridge production traffic
+    if: >-
+      github.event_name == 'workflow_dispatch' && github.ref == 'refs/heads/main' &&
+      github.run_attempt == 1 &&
+      ((inputs.deployment_mode == 'legacy' && inputs.shift_traffic_to_commit) ||
+      (inputs.deployment_mode == 'sg-serving-snapshot' && inputs.target == 'SG' && inputs.account_snapshot_enabled == 'true') ||
+      ((inputs.deployment_mode == 'image-only-no-traffic' || inputs.deployment_mode == 'image-only-notification-overlay') &&
+      inputs.target == 'HK' && inputs.account_snapshot_enabled == 'true'))
+    environment: longbridge-live-approval
+    runs-on: ubuntu-latest
+    timeout-minutes: 3
+    permissions: {}
+    steps:
+      - name: Record approval
+        run: echo "Approved the production traffic change for this dispatch." >> "$GITHUB_STEP_SUMMARY"
+
   image-only-no-traffic:
     name: Stage ${{ inputs.target }} image without traffic
-    if: github.event_name == 'workflow_dispatch' && (inputs.deployment_mode == 'image-only-no-traffic' || inputs.deployment_mode == 'image-only-notification-overlay')
+    needs: approve-live-traffic
+    if: >-
+      !cancelled() && github.event_name == 'workflow_dispatch' &&
+      (inputs.deployment_mode == 'image-only-no-traffic' || inputs.deployment_mode == 'image-only-notification-overlay') &&
+      (needs.approve-live-traffic.result == 'success' ||
+      (needs.approve-live-traffic.result == 'skipped' &&
+      !(inputs.target == 'HK' && inputs.account_snapshot_enabled == 'true')))
     runs-on: ubuntu-latest
     timeout-minutes: 20
     permissions:
@@ -652,10 +675,14 @@ jobs:
           python3 scripts/render_runtime_target_matrix.py --profile sync --github-output
 
   sync:
-    needs: resolve-matrix
+    needs: [resolve-matrix, approve-live-traffic]
     name: Deploy / Sync ${{ matrix.target.label }} Cloud Run
     # Production deployment and environment sync require an explicit operator dispatch.
-    if: github.event_name == 'workflow_dispatch' && inputs.deployment_mode == 'legacy'
+    if: >-
+      !cancelled() && github.event_name == 'workflow_dispatch' &&
+      inputs.deployment_mode == 'legacy' && needs.resolve-matrix.result == 'success' &&
+      (needs.approve-live-traffic.result == 'success' ||
+      (needs.approve-live-traffic.result == 'skipped' && !inputs.shift_traffic_to_commit))
     runs-on: ubuntu-latest
     timeout-minutes: 20
     strategy:
@@ -2312,8 +2339,9 @@ jobs:
 
   sg-serving-snapshot:
     name: Enable only the SG read-only snapshot
+    needs: approve-live-traffic
     if: >-
-      github.event_name == 'workflow_dispatch' && github.ref == 'refs/heads/main' &&
+      needs.approve-live-traffic.result == 'success' && github.event_name == 'workflow_dispatch' && github.ref == 'refs/heads/main' &&
       github.run_attempt == 1 && inputs.deployment_mode == 'sg-serving-snapshot' &&
       inputs.target == 'SG' && inputs.approved_ref == 'main' &&
       inputs.account_snapshot_enabled == 'true' &&
diff --git a/docs/runtime-write-isolation.md b/docs/runtime-write-isolation.md
index 4454e55..34a267f 100644
--- a/docs/runtime-write-isolation.md
+++ b/docs/runtime-write-isolation.md
@@ -317,3 +317,13 @@ staging; this mode neither changes configuration nor moves traffic.
 
 
 
+
+
+## Production traffic approval
+
+LongBridge traffic promotion uses the `longbridge-live-approval` Environment
+on `main`. This covers explicit `shift_traffic_to_commit` and the HK and SG snapshot
+modes that promote a serving revision. Staging without traffic and
+standalone readback skip this approval. The existing runtime-target,
+revision and readback checks still run before or after the traffic change
+as appropriate.
diff --git a/tests/test_runtime_target_matrix.py b/tests/test_runtime_target_matrix.py
index d24e86e..1dad22a 100644
--- a/tests/test_runtime_target_matrix.py
+++ b/tests/test_runtime_target_matrix.py
@@ -280,7 +280,8 @@ def test_monitor_and_deploy_workflows_consume_validated_matrix_output():
             assert 'render_runtime_target_matrix.py --profile heartbeat --target "$MATRIX_TARGET" --github-output' in text
         else:
             assert f"render_runtime_target_matrix.py --profile {profile} --github-output" in text
-        assert "needs: resolve-matrix" in text
+        dependency = "needs: [resolve-matrix, approve-live-traffic]" if profile == "sync" else "needs: resolve-matrix"
+        assert dependency in text
         assert "matrix: ${{ fromJSON(needs.resolve-matrix.outputs.matrix) }}" in text
         assert "vars.RUNTIME_TARGET_ENABLED" in text
         # Hardcoded PAPER/HK/SG matrix blocks must not remain in dynamic consumers.
diff --git a/tests/test_sync_cloud_run_env_workflow.sh b/tests/test_sync_cloud_run_env_workflow.sh
index 428d43c..ad32b08 100644
--- a/tests/test_sync_cloud_run_env_workflow.sh
+++ b/tests/test_sync_cloud_run_env_workflow.sh
@@ -10,7 +10,7 @@ grep -Fq 'name: Deploy / Sync ${{ matrix.target.label }} Cloud Run' "$workflow_f
 grep -Fq 'fail-fast: false' "$workflow_file"
 grep -Fq 'resolve-matrix:' "$workflow_file"
 grep -Fq 'render_runtime_target_matrix.py --profile sync --github-output' "$workflow_file"
-grep -Fq 'needs: resolve-matrix' "$workflow_file"
+grep -Fq 'needs: [resolve-matrix, approve-live-traffic]' "$workflow_file"
 grep -Fq 'matrix: ${{ fromJSON(needs.resolve-matrix.outputs.matrix) }}' "$workflow_file"
 grep -Fq "inputs.target == 'PAPER' && 'longbridge-paper'" "$workflow_file"
 grep -Fq "inputs.target == 'HK' && 'longbridge-hk'" "$workflow_file"
@@ -448,7 +448,12 @@ assert "name: Mask WIF identity components" in masking
 assert "if: matrix.target.environment == 'longbridge-paper' && steps.config.outputs.enabled == 'true'" in masking
 for section in (legacy, cleanup):
     assert "inputs.deployment_mode == 'legacy'" in section.split("    steps:", 1)[0]
-assert "needs: resolve-matrix" in legacy.split("    steps:", 1)[0]
+assert "needs: [resolve-matrix, approve-live-traffic]" in legacy.split("    steps:", 1)[0]
+assert "needs.approve-live-traffic.result == 'success'" in legacy.split("    steps:", 1)[0]
+assert "needs.approve-live-traffic.result == 'success'" in job.split("    steps:", 1)[0]
+sg_snapshot = workflow.split("\n  sg-serving-snapshot:\n", 1)[1]
+assert "needs: approve-live-traffic" in sg_snapshot.split("    steps:", 1)[0]
+assert "needs.approve-live-traffic.result == 'success'" in sg_snapshot.split("    steps:", 1)[0]
 assert job.index("name: Validate image-only dispatch") < job.index("uses: google-github-actions/auth@")
 assert job.index("name: Verify exact image-only source") < job.index("uses: google-github-actions/auth@")
 # Only the service selector, protected WIF identity and immutable overlay inputs are allowed;