diff --git a/scripts/lib/cesium-preview.js b/scripts/lib/cesium-preview.js
index 97c2d6f..c73fe38 100644
--- a/scripts/lib/cesium-preview.js
+++ b/scripts/lib/cesium-preview.js
@@ -293,8 +293,9 @@
     async function setBuildingGhost(enabled) {
       const roads = assets.find((asset) => asset.id === "roads");
       const buildings = assets.find((asset) => asset.id === "buildings");
+      const props = assets.find((asset) => asset.id === "vegetation");
       const main = assets.find((asset) => asset.id === "main");
-      if (!roads || !buildings || !main) {
+      if (!roads || !buildings || !props || !main) {
         toggleBuildingGhost.checked = false;
         toggleBuildingGhost.disabled = true;
         return;
@@ -303,8 +304,9 @@
         const loaded = await Promise.all([
           loadAsset(viewer, roads, placement),
           loadAsset(viewer, buildings, placement),
+          loadAsset(viewer, props, placement),
         ]);
-        if (!loaded[0] || !loaded[1]) {
+        if (!loaded[0] || !loaded[1] || !loaded[2]) {
           toggleBuildingGhost.checked = false;
           setStatus("Building transparency unavailable");
           return;
@@ -312,6 +314,9 @@
         main.model.show = false;
         roads.model.show = true;
         buildings.model.show = true;
+        // The semantic vegetation asset also owns the static traffic-signal
+        // poles/housings from the 05_Props collection.
+        props.model.show = true;
         buildings.model.color = Cesium.Color.WHITE.withAlpha(0.22);
         buildings.model.colorBlendMode = Cesium.ColorBlendMode.REPLACE;
         buildings.model.colorBlendAmount = 1.0;
@@ -368,7 +373,8 @@
       void setBuildingGhost(toggleBuildingGhost.checked);
     });
     if (!semanticAssets(assets).some((asset) => asset.id === "roads") ||
-        !semanticAssets(assets).some((asset) => asset.id === "buildings")) {
+        !semanticAssets(assets).some((asset) => asset.id === "buildings") ||
+        !semanticAssets(assets).some((asset) => asset.id === "vegetation")) {
       toggleBuildingGhost.disabled = true;
     }