diff --git a/static/v3/index.html b/static/v3/index.html
index 535d11e..bb731a2 100644
--- a/static/v3/index.html
+++ b/static/v3/index.html
@@ -708,6 +708,14 @@
                         <option value="0.5">Low</option>
                     </select>
                 </div>
+                <div class="v3-pop-row">
+                    <span class="v3-pop-label" id="scoreboard-label">Scoreboard</span>
+                    <select id="scoreboard-select" onchange="setScoreboard(this.value)" class="v3-pop-select" aria-labelledby="scoreboard-label" title="Highway scoreboard">
+                        <option value="core" selected>Streak</option>
+                        <option value="detailed">Detailed</option>
+                        <option value="off">Off</option>
+                    </select>
+                </div>
                 <div class="v3-pop-row">
                     <span class="v3-pop-label" id="venue-motion-label">Venue Motion</span>
                     <select id="venue-motion-select" class="v3-pop-select" aria-labelledby="venue-motion-label" title="Venue Motion">
@@ -858,6 +866,7 @@
     <script src="/static/v3/badges.js"></script>
     <script src="/static/v3/stats-recorder.js"></script>
     <script src="/static/v3/live-performance-hud.js"></script>
+    <script src="/static/v3/scoreboard-pref.js"></script>
     <script src="/static/v3/venue-viz.js"></script>
     <script src="/static/v3/venue-instrument-pov.js"></script>
     <!-- venue-mood-fx must load before venue-scene-3d: the scene bridge reads
diff --git a/static/v3/scoreboard-pref.js b/static/v3/scoreboard-pref.js
new file mode 100644
index 0000000..0753ef4
--- /dev/null
+++ b/static/v3/scoreboard-pref.js
@@ -0,0 +1,50 @@
+/*
+ * fee[dB]ack — highway scoreboard preference.
+ *
+ * The 3D/2D highway can show note-detection scoring two ways: the core v3
+ * live-performance HUD (#v3-live-performance-hud) and the note_detect plugin's
+ * own HUD (.nd-hud). Both auto-render off the same note:hit/note:miss events,
+ * so without a preference you get two overlapping scoreboards.
+ *
+ * This module is the single source of truth: it writes <html data-scoreboard>
+ * (core | detailed | off) and CSS in v3.css hides the non-selected HUD(s).
+ * Default is 'core'. The CSS keys the default off "not detailed and not off",
+ * so the right HUD is correct even before this script runs (no flash).
+ */
+(function () {
+    'use strict';
+
+    var KEY = 'highwayScoreboard';
+    var VALID = { core: 1, detailed: 1, off: 1 };
+
+    function read() {
+        var v = null;
+        try { v = localStorage.getItem(KEY); } catch (_e) { /* private mode */ }
+        return VALID[v] ? v : 'core';
+    }
+
+    function apply(v) {
+        if (document.documentElement) {
+            document.documentElement.setAttribute('data-scoreboard', v);
+        }
+    }
+
+    function setScoreboard(v) {
+        if (!VALID[v]) v = 'core';
+        try { localStorage.setItem(KEY, v); } catch (_e) { /* private mode */ }
+        apply(v);
+        var sel = document.getElementById('scoreboard-select');
+        if (sel && sel.value !== v) sel.value = v;
+    }
+
+    // Apply immediately so the correct HUD is set before the first note arrives.
+    apply(read());
+
+    // onchange="setScoreboard(this.value)" on the Settings select.
+    window.setScoreboard = setScoreboard;
+
+    document.addEventListener('DOMContentLoaded', function () {
+        var sel = document.getElementById('scoreboard-select');
+        if (sel) sel.value = read();
+    });
+})();
diff --git a/static/v3/v3.css b/static/v3/v3.css
index 573f60f..e60e2d6 100644
--- a/static/v3/v3.css
+++ b/static/v3/v3.css
@@ -313,6 +313,19 @@
     transition: border-color .35s ease, box-shadow .35s ease, background .35s ease;
 }
 .v3-live-performance-hud.hidden { display: none; }
+
+/* Highway scoreboard preference (static/v3/scoreboard-pref.js).
+   One note-detection scoreboard at a time on the highway:
+     core (default) → core live-performance HUD; hide the note_detect plugin HUD
+     detailed       → note_detect .nd-hud; hide the core HUD
+     off            → hide both
+   The default rule keys off "not detailed and not off" so it's correct even
+   before the pref script sets data-scoreboard (avoids a flash of both). */
+html:not([data-scoreboard="detailed"]):not([data-scoreboard="off"]) .nd-hud { display: none !important; }
+html[data-scoreboard="detailed"] #v3-live-performance-hud { display: none !important; }
+html[data-scoreboard="off"] .nd-hud,
+html[data-scoreboard="off"] #v3-live-performance-hud { display: none !important; }
+
 .v3-live-performance-heading {
     display: flex;
     align-items: baseline;
