Add traffic lane GPS weighting toolkit

tests/test_patch_traffic_lanes.py

@@ -0,0 +1,33 @@
+import json
+import subprocess
+import sys
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+TOOL = ROOT / "tools" / "patch_traffic_lanes.py"
+
+
+def test_patch_sample(tmp_path):
+    output = tmp_path / "patched.json"
+
+    result = subprocess.run(
+        [
+            sys.executable,
+            str(TOOL),
+            str(ROOT / "samples" / "traffic_resource.json"),
+            str(output),
+        ],
+        check=True,
+        text=True,
+        capture_output=True,
+    )
+
+    assert "lanes changed: 2" in result.stdout
+
+    patched = json.loads(output.read_text(encoding="utf-8"))
+    lanes = patched["Data"]["RootChunk"]["data"]["lanes"]
+
+    assert lanes[0]["maxSpeed"] == 90
+    assert lanes[1]["maxSpeed"] == 45
+    assert lanes[2]["maxSpeed"] == 10