diff --git a/backend/report.html b/backend/report.html
index 753edd0..c5a4bf3 100644
--- a/backend/report.html
+++ b/backend/report.html
@@ -328,7 +328,7 @@ div.media {
   </head>
   <body>
     <h1 id="title">Backend Testing Report</h1>
-    <p>Report generated on 21-Nov-2024 at 14:51:16 by <a href="https://pypi.python.org/pypi/pytest-html">pytest-html</a>
+    <p>Report generated on 30-Nov-2024 at 16:56:54 by <a href="https://pypi.python.org/pypi/pytest-html">pytest-html</a>
         v4.1.1</p>
     <div id="environment-header">
       <h2>Environment</h2>
@@ -382,7 +382,7 @@ div.media {
         <h2>Summary</h2>
         <div class="additional-summary prefix">
         </div>
-        <p class="run-count">3 tests took 00:00:43.</p>
+        <p class="run-count">10 tests took 00:00:11.</p>
         <p class="filter">(Un)check the boxes to filter the results.</p>
         <div class="summary__reload">
           <div class="summary__reload__button hidden" onclick="location.reload()">
@@ -395,7 +395,7 @@ div.media {
             <input checked="true" class="filter" name="filter_checkbox" type="checkbox" data-test-result="failed" />
             <span class="failed">1 Failed,</span>
             <input checked="true" class="filter" name="filter_checkbox" type="checkbox" data-test-result="passed" />
-            <span class="passed">2 Passed,</span>
+            <span class="passed">9 Passed,</span>
             <input checked="true" class="filter" name="filter_checkbox" type="checkbox" data-test-result="skipped" disabled/>
             <span class="skipped">0 Skipped,</span>
             <input checked="true" class="filter" name="filter_checkbox" type="checkbox" data-test-result="xfailed" disabled/>
@@ -432,7 +432,7 @@ div.media {
     </table>
   </body>
   <footer>
-    <div id="data-container" data-jsonblob="{&#34;environment&#34;: {&#34;Python&#34;: &#34;3.12.3&#34;, &#34;Platform&#34;: &#34;Linux-6.8.0-49-generic-x86_64-with-glibc2.39&#34;, &#34;Packages&#34;: {&#34;pytest&#34;: &#34;8.3.3&#34;, &#34;pluggy&#34;: &#34;1.5.0&#34;}, &#34;Plugins&#34;: {&#34;html&#34;: &#34;4.1.1&#34;, &#34;metadata&#34;: &#34;3.1.1&#34;, &#34;anyio&#34;: &#34;4.6.2.post1&#34;}}, &#34;tests&#34;: {&#34;src/tests/test_main.py::test_new_trip_invalid_prefs&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_main.py::test_new_trip_invalid_prefs&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_main.py::test_new_trip_invalid_prefs&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;15 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_main.py::test_turckheim&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_main.py::test_turckheim&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_main.py::test_turckheim&lt;/td&gt;&#34;, &#34;&lt;td&gt;start (0) - 5 - Porte de France (257) - 5 - finish (0) - 0&lt;/td&gt;&#34;, &#34;&lt;td&gt;15 min&lt;/td&gt;&#34;, &#34;&lt;td&gt;15 min&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;29 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_main.py::test_bellecour&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Failed&#34;, &#34;testId&#34;: &#34;src/tests/test_main.py::test_bellecour&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Failed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_main.py::test_bellecour&lt;/td&gt;&#34;, &#34;&lt;td&gt;start (0) - 11 - Impasse Turquet (387) - 9 - Site historique de Lyon (681) - 13 - Fontaine des Jacobins (163) - 6 - finish (0) - 0&lt;/td&gt;&#34;, &#34;&lt;td&gt;54 min&lt;/td&gt;&#34;, &#34;&lt;td&gt;50 min&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;00:00:43&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;client = &amp;lt;starlette.testclient.TestClient object at 0x79ec42b03980&amp;gt;\nrequest = &amp;lt;FixtureRequest for &amp;lt;Function test_bellecour&amp;gt;&amp;gt;\n\n    def test_bellecour(client, request) :\n        duration_minutes = 50\n        response = client.post(\n            &amp;quot;/trip/new&amp;quot;,\n            json={\n                &amp;quot;preferences&amp;quot;: {&amp;quot;sightseeing&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;sightseeing&amp;quot;, &amp;quot;score&amp;quot;: 5}, &amp;quot;nature&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;nature&amp;quot;, &amp;quot;score&amp;quot;: 5}, &amp;quot;shopping&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;shopping&amp;quot;, &amp;quot;score&amp;quot;: 5}, &amp;quot;max_time_minute&amp;quot;: duration_minutes, &amp;quot;detour_tolerance_minute&amp;quot;: 0},\n                &amp;quot;start&amp;quot;: [45.7576485, 4.8330241]\n                }\n            )\n        result = response.json()\n        landmarks = load_trip_landmarks(client, result[&amp;#x27;first_landmark_uuid&amp;#x27;])\n        osm_ids = landmarks_to_osmid(landmarks)\n    \n        # Create the trip string\n        trip_string = [f&amp;quot;{landmark.name} ({landmark.attractiveness}) - {landmark.time_to_reach_next}&amp;quot; for landmark in landmarks]\n    \n        # Pass additional info to pytest for reporting\n        request.node.trip_details = trip_string\n        request.node.trip_duration = str(result[&amp;#x27;total_time&amp;#x27;])\n        request.node.target_duration = str(duration_minutes)\n    \n        # checks :\n        assert response.status_code == 200  # check for successful planning\n        assert duration_minutes*0.8 &amp;lt; int(result[&amp;#x27;total_time&amp;#x27;]) &amp;lt; duration_minutes*1.2\n&amp;gt;       assert 136200148 in osm_ids         # check for Cath\u00e9drale St. Jean in trip\nE       assert 136200148 in [0, 120502985, 236823541, 25101472, 0]\n\nsrc/tests/test_main.py:78: AssertionError\n&#34;}]}, &#34;renderCollapsed&#34;: [&#34;passed&#34;], &#34;initialSort&#34;: &#34;result&#34;, &#34;title&#34;: &#34;Backend Testing Report&#34;}"></div>
+    <div id="data-container" data-jsonblob="{&#34;environment&#34;: {&#34;Python&#34;: &#34;3.12.3&#34;, &#34;Platform&#34;: &#34;Linux-6.8.0-49-generic-x86_64-with-glibc2.39&#34;, &#34;Packages&#34;: {&#34;pytest&#34;: &#34;8.3.3&#34;, &#34;pluggy&#34;: &#34;1.5.0&#34;}, &#34;Plugins&#34;: {&#34;html&#34;: &#34;4.1.1&#34;, &#34;metadata&#34;: &#34;3.1.1&#34;, &#34;anyio&#34;: &#34;4.6.2.post1&#34;}}, &#34;tests&#34;: {&#34;src/tests/test_invalid_input.py::test_input[start0-preferences0-422]&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_invalid_input.py::test_input[start0-preferences0-422]&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_invalid_input.py::test_input[start0-preferences0-422]&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;14 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_invalid_input.py::test_input[start1-preferences1-422]&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_invalid_input.py::test_input[start1-preferences1-422]&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_invalid_input.py::test_input[start1-preferences1-422]&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;2 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_invalid_input.py::test_input[start2-preferences2-422]&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_invalid_input.py::test_input[start2-preferences2-422]&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_invalid_input.py::test_input[start2-preferences2-422]&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;2 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_invalid_input.py::test_input[start3-preferences3-422]&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_invalid_input.py::test_input[start3-preferences3-422]&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_invalid_input.py::test_input[start3-preferences3-422]&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;5 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_invalid_input.py::test_input[start4-preferences4-423]&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_invalid_input.py::test_input[start4-preferences4-423]&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_invalid_input.py::test_input[start4-preferences4-423]&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;3 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_invalid_input.py::test_input[start5-preferences5-423]&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_invalid_input.py::test_input[start5-preferences5-423]&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_invalid_input.py::test_input[start5-preferences5-423]&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;4 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_invalid_input.py::test_input[start6-preferences6-423]&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_invalid_input.py::test_input[start6-preferences6-423]&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_invalid_input.py::test_input[start6-preferences6-423]&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;2 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_invalid_input.py::test_input[start7-preferences7-423]&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_invalid_input.py::test_input[start7-preferences7-423]&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_invalid_input.py::test_input[start7-preferences7-423]&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td&gt;N/A&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;4 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_main.py::test_turckheim&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Passed&#34;, &#34;testId&#34;: &#34;src/tests/test_main.py::test_turckheim&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Passed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_main.py::test_turckheim&lt;/td&gt;&#34;, &#34;&lt;td&gt;start (0 | 0) - 5 - Porte de France (257 | 5) - 5 - finish (0 | 0) - 0&lt;/td&gt;&#34;, &#34;&lt;td&gt;15 min&lt;/td&gt;&#34;, &#34;&lt;td&gt;15 min&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;21 ms&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;No log output captured.&#34;}], &#34;src/tests/test_main.py::test_bellecour&#34;: [{&#34;extras&#34;: [], &#34;result&#34;: &#34;Failed&#34;, &#34;testId&#34;: &#34;src/tests/test_main.py::test_bellecour&#34;, &#34;resultsTableRow&#34;: [&#34;&lt;td class=\&#34;col-result\&#34;&gt;Failed&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-testId\&#34;&gt;src/tests/test_main.py::test_bellecour&lt;/td&gt;&#34;, &#34;&lt;td&gt;start (0 | 0) - 3 - M\u00e9morial Lyonnais du G\u00e9nocide Arm\u00e9nien (265 | 5) - 4 - \u00c9glise Saint-Fran\u00e7ois-de-Sales (211 | 5) - 4 - Chapelle des J\u00e9suites (161 | 5) - 7 - finish (0 | 0) - 0&lt;/td&gt;&#34;, &#34;&lt;td&gt;33 min&lt;/td&gt;&#34;, &#34;&lt;td&gt;30 min&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-duration\&#34;&gt;00:00:11&lt;/td&gt;&#34;, &#34;&lt;td class=\&#34;col-links\&#34;&gt;&lt;/td&gt;&#34;], &#34;log&#34;: &#34;client = &amp;lt;starlette.testclient.TestClient object at 0x770e13acd3d0&amp;gt;\nrequest = &amp;lt;FixtureRequest for &amp;lt;Function test_bellecour&amp;gt;&amp;gt;\n\n    def test_bellecour(client, request) :\n        &amp;quot;&amp;quot;&amp;quot;\n        Test n\u00b02 : Custom test in Lyon centre to ensure proper decision making in crowded area.\n    \n        Args:\n            client:\n            request:\n        &amp;quot;&amp;quot;&amp;quot;\n        duration_minutes = 30\n        response = client.post(\n            &amp;quot;/trip/new&amp;quot;,\n            json={\n                &amp;quot;preferences&amp;quot;: {&amp;quot;sightseeing&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;sightseeing&amp;quot;, &amp;quot;score&amp;quot;: 5}, &amp;quot;nature&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;nature&amp;quot;, &amp;quot;score&amp;quot;: 5}, &amp;quot;shopping&amp;quot;: {&amp;quot;type&amp;quot;: &amp;quot;shopping&amp;quot;, &amp;quot;score&amp;quot;: 5}, &amp;quot;max_time_minute&amp;quot;: duration_minutes, &amp;quot;detour_tolerance_minute&amp;quot;: 0},\n                &amp;quot;start&amp;quot;: [45.7576485, 4.8330241]\n                }\n            )\n        result = response.json()\n        landmarks = load_trip_landmarks(client, result[&amp;#x27;first_landmark_uuid&amp;#x27;])\n        osm_ids = landmarks_to_osmid(landmarks)\n    \n        # Add details to report\n        log_trip_details(request, landmarks, result[&amp;#x27;total_time&amp;#x27;], duration_minutes)\n    \n        # checks :\n        assert response.status_code == 200  # check for successful planning\n        assert duration_minutes*0.8 &amp;lt; int(result[&amp;#x27;total_time&amp;#x27;]) &amp;lt; duration_minutes*1.2\n&amp;gt;       assert 136200148 in osm_ids         # check for Cath\u00e9drale St. Jean in trip\nE       assert 136200148 in [0, 265922306, 82260098, 144904193, 0]\n\nsrc/tests/test_main.py:73: AssertionError\n&#34;}]}, &#34;renderCollapsed&#34;: [&#34;passed&#34;], &#34;initialSort&#34;: &#34;result&#34;, &#34;title&#34;: &#34;Backend Testing Report&#34;}"></div>
     <script>
       (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
 const { getCollapsedCategory, setCollapsedIds } = require('./storage.js')
diff --git a/backend/src/main.py b/backend/src/main.py
index b9d5e40..98fda77 100644
--- a/backend/src/main.py
+++ b/backend/src/main.py
@@ -39,6 +39,8 @@ def new_trip(preferences: Preferences, start: tuple[float, float], end: tuple[fl
         raise HTTPException(status_code=406, detail="All preferences are 0.")
     if start is None:
         raise HTTPException(status_code=406, detail="Start coordinates not provided")
+    if not (-90 <= start[0] <= 90 or -180 <= start[1] <= 180):
+        raise HTTPException(status_code=423, detail="Start coordinates not in range")
     if end is None:
         end = start
         logger.info("No end coordinates provided. Using start=end.")
@@ -59,10 +61,10 @@ def new_trip(preferences: Preferences, start: tuple[float, float], end: tuple[fl
     # First stage optimization
     try:
         base_tour = optimizer.solve_optimization(preferences.max_time_minute, landmarks_short)
-    except ArithmeticError:
-        raise HTTPException(status_code=500, detail="No solution found")
-    except TimeoutError:
-        raise HTTPException(status_code=500, detail="Optimzation took too long")
+    except ArithmeticError as exc:
+        raise HTTPException(status_code=500, detail="No solution found") from exc
+    except TimeoutError as exc:
+        raise HTTPException(status_code=500, detail="Optimzation took too long") from exc
 
     # Second stage optimization
     refined_tour = refiner.refine_optimization(landmarks, base_tour, preferences.max_time_minute, preferences.detour_tolerance_minute)
@@ -88,8 +90,8 @@ def get_trip(trip_uuid: str) -> Trip:
     try:
         trip = cache_client.get(f"trip_{trip_uuid}")
         return trip
-    except KeyError:
-        raise HTTPException(status_code=404, detail="Trip not found")
+    except KeyError as exc:
+        raise HTTPException(status_code=404, detail="Trip not found") from exc
 
 
 @app.get("/landmark/{landmark_uuid}")
@@ -106,5 +108,5 @@ def get_landmark(landmark_uuid: str) -> Landmark:
     try:
         landmark = cache_client.get(f"landmark_{landmark_uuid}")
         return landmark
-    except KeyError:
-        raise HTTPException(status_code=404, detail="Landmark not found")
+    except KeyError as exc:
+        raise HTTPException(status_code=404, detail="Landmark not found") from exc
diff --git a/backend/src/parameters/amenity_selectors.yaml b/backend/src/parameters/amenity_selectors.yaml
index 7d0fabc..551852b 100644
--- a/backend/src/parameters/amenity_selectors.yaml
+++ b/backend/src/parameters/amenity_selectors.yaml
@@ -71,8 +71,10 @@ sightseeing:
     - castle
     - museum
 
-
-
+museums:
+  tourism:
+    - museum
+    - aquarium
 
 # to be used later on
 restauration:
diff --git a/backend/src/persistence.py b/backend/src/persistence.py
index 029353b..97bfaf0 100644
--- a/backend/src/persistence.py
+++ b/backend/src/persistence.py
@@ -28,7 +28,7 @@ class DummyClient:
             dictionary.
     """
     _data = {}
-    def set(self, key, value, **kwargs):
+    def set(self, key, value, **kwargs):    # pylint: disable=unused-argument
         """
         Store a key-value pair in the internal dictionary.
 
@@ -39,7 +39,7 @@ class DummyClient:
         """
         self._data[key] = value
 
-    def set_many(self, data, **kwargs):
+    def set_many(self, data, **kwargs): # pylint: disable=unused-argument
         """
         Update the internal dictionary with multiple key-value pairs.
 
@@ -49,7 +49,7 @@ class DummyClient:
         """
         self._data.update(data)
 
-    def get(self, key, **kwargs):
+    def get(self, key, **kwargs):   # pylint: disable=unused-argument
         """
         Retrieve the value associated with the given key.
 
diff --git a/backend/src/structs/landmark.py b/backend/src/structs/landmark.py
index a3eb87c..66cd564 100644
--- a/backend/src/structs/landmark.py
+++ b/backend/src/structs/landmark.py
@@ -71,9 +71,11 @@ class Landmark(BaseModel) :
             time to the next landmark (if available), and whether the landmark is secondary.
         """
         time_to_next_str = f", time_to_next={self.time_to_reach_next}" if self.time_to_reach_next else ""
-        is_secondary_str = f", secondary" if self.is_secondary else ""
+        is_secondary_str = ", secondary" if self.is_secondary else ""
         type_str = '(' + self.type + ')'
-        if self.type in ["start", "finish", "nature", "shopping"] : type_str += '\t '
+        if self.type in ["start", "finish", "nature", "shopping"] :
+            type_str += '\t '
+
         return f'Landmark{type_str}: [{self.name} @{self.location}, score={self.attractiveness}{time_to_next_str}{is_secondary_str}]'
 
     def distance(self, value: 'Landmark') -> float:
diff --git a/backend/src/structs/linked_landmarks.py b/backend/src/structs/linked_landmarks.py
index 5a6a216..89f6860 100644
--- a/backend/src/structs/linked_landmarks.py
+++ b/backend/src/structs/linked_landmarks.py
@@ -11,7 +11,7 @@ class LinkedLandmarks:
     to reference the next landmark in the list. This is not very efficient, but appropriate for the expected use case
     ("short" trips with onyl few landmarks).
     """
-    
+
     _landmarks = list[Landmark]
     total_time: int = 0
 
diff --git a/backend/src/structs/preferences.py b/backend/src/structs/preferences.py
index 2c6d038..64b8837 100644
--- a/backend/src/structs/preferences.py
+++ b/backend/src/structs/preferences.py
@@ -30,5 +30,5 @@ class Preferences(BaseModel) :
     # Shopping (diriger plutôt vers des zones / rues commerçantes)
     shopping : Preference
 
-    max_time_minute: Optional[int] = 6*60
+    max_time_minute: Optional[int] = 3*60
     detour_tolerance_minute: Optional[int] = 0
diff --git a/backend/src/structs/trip.py b/backend/src/structs/trip.py
index 5f4f50c..6e50b62 100644
--- a/backend/src/structs/trip.py
+++ b/backend/src/structs/trip.py
@@ -25,7 +25,7 @@ class Trip(BaseModel):
 
 
     @classmethod
-    def from_linked_landmarks(self, landmarks: LinkedLandmarks, cache_client: Client) -> "Trip":
+    def from_linked_landmarks(cls, landmarks: LinkedLandmarks, cache_client: Client) -> "Trip":
         """
         Initialize a new Trip object and ensure it is stored in the cache.
         """
diff --git a/backend/src/tests/test_invalid_input.py b/backend/src/tests/test_invalid_input.py
new file mode 100644
index 0000000..4330337
--- /dev/null
+++ b/backend/src/tests/test_invalid_input.py
@@ -0,0 +1,62 @@
+"""Collection of tests to ensure correct handling of invalid input."""
+
+from fastapi.testclient import TestClient
+import pytest
+
+from ..main import app
+
+
+@pytest.fixture(scope="module")
+def invalid_client():
+    """Client used to call the app."""
+    return TestClient(app)
+
+
+@pytest.mark.parametrize(
+    "start,preferences,status_code",
+    [
+        # Invalid case: no preferences at all.
+        ([48.8566, 2.3522], {}, 422),
+
+        # Invalid cases: incomplete preferences.
+        ([48.084588, 7.280405], {"sightseeing": {"type": "nature", "score": 5}, # no shopping
+                                 "nature": {"type": "nature", "score": 5},
+                                 }, 422),
+        ([48.084588, 7.280405], {"sightseeing": {"type": "nature", "score": 5}, # no nature
+                                 "shopping": {"type": "shopping", "score": 5},
+                                 }, 422),
+        ([48.084588, 7.280405], {"nature": {"type": "nature", "score": 5},      # no sightseeing
+                                 "shopping": {"type": "shopping", "score": 5},
+                                 }, 422),
+
+        # Invalid cases: unexisting coords
+        ([91, 181], {"sightseeing": {"type": "nature", "score": 5},
+                     "nature": {"type": "nature", "score": 5},
+                     "shopping": {"type": "shopping", "score": 5},
+                    }, 423),
+        ([-91, 181], {"sightseeing": {"type": "nature", "score": 5},
+                     "nature": {"type": "nature", "score": 5},
+                     "shopping": {"type": "shopping", "score": 5},
+                    }, 423),
+        ([91, -181], {"sightseeing": {"type": "nature", "score": 5},
+                     "nature": {"type": "nature", "score": 5},
+                     "shopping": {"type": "shopping", "score": 5},
+                    }, 423),
+        ([-91, -181], {"sightseeing": {"type": "nature", "score": 5},
+                     "nature": {"type": "nature", "score": 5},
+                     "shopping": {"type": "shopping", "score": 5},
+                    }, 423),
+    ]
+)
+def test_input(invalid_client, start, preferences, status_code):   # pylint: disable=redefined-outer-name
+    """
+    Test new trip creation with different sets of preferences and locations.
+    """
+    response = invalid_client.post(
+        "/trip/new",
+        json={
+            "preferences": preferences,
+            "start": start
+        }
+    )
+    assert response.status_code == status_code
diff --git a/backend/src/tests/test_main.py b/backend/src/tests/test_main.py
index e4d3cf5..948d09b 100644
--- a/backend/src/tests/test_main.py
+++ b/backend/src/tests/test_main.py
@@ -1,38 +1,20 @@
 """Collection of tests to ensure correct implementation and track progress. """
 
-from typing import List
 from fastapi.testclient import TestClient
 import pytest
 
+from .test_utils import landmarks_to_osmid, load_trip_landmarks, log_trip_details
 from ..main import app
-from ..structs.landmark import Landmark
 
-
-@pytest.fixture()
+@pytest.fixture(scope="module")
 def client():
+    """Client used to call the app."""
     return TestClient(app)
 
 
-def test_new_trip_invalid_prefs(client):
+def test_turckheim(client, request):    # pylint: disable=redefined-outer-name
     """
-    Test n°1 : base test for checking if the API returns correct error code when no preferences are specified.
-
-    Args:
-        client:
-    """
-    response = client.post(
-        "/trip/new",
-        json={
-            "preferences": {},
-            "start": [48.8566, 2.3522]
-            }
-        )
-    assert response.status_code == 422
-
-
-def test_turckheim(client, request):
-    """
-    Test n°2 : Custom test in Turckheim to ensure small villages are also supported.
+    Test n°1 : Custom test in Turckheim to ensure small villages are also supported.
 
     Args:
         client:
@@ -42,7 +24,11 @@ def test_turckheim(client, request):
     response = client.post(
         "/trip/new",
         json={
-            "preferences": {"sightseeing": {"type": "sightseeing", "score": 5}, "nature": {"type": "nature", "score": 5}, "shopping": {"type": "shopping", "score": 5}, "max_time_minute": duration_minutes, "detour_tolerance_minute": 0},
+            "preferences": {"sightseeing": {"type": "sightseeing", "score": 5},
+            "nature": {"type": "nature", "score": 5},
+            "shopping": {"type": "shopping", "score": 5},
+            "max_time_minute": duration_minutes,
+            "detour_tolerance_minute": 0},
             "start": [48.084588, 7.280405]
             }
         )
@@ -59,16 +45,15 @@ def test_turckheim(client, request):
     assert len(landmarks) > 2           # check that there is something to visit
 
 
-# Test no. 3
-def test_bellecour(client, request) :
+def test_bellecour(client, request) :   # pylint: disable=redefined-outer-name
     """
-    Test n°3 : Custom test in Lyon centre to ensure proper decision making in crowded area.
+    Test n°2 : Custom test in Lyon centre to ensure proper decision making in crowded area.
     
     Args:
         client:
         request:
     """
-    duration_minutes = 60
+    duration_minutes = 30
     response = client.post(
         "/trip/new",
         json={
@@ -90,89 +75,6 @@ def test_bellecour(client, request) :
 
 
 
-def landmarks_to_osmid(landmarks: List[Landmark]) -> List[int] :
-    """
-    Convert the list of landmarks into a list containing their osm ids for quick landmark checking.
-    
-    Args :
-        landmarks (list): the list of landmarks
-    
-    Returns :
-        ids (list)      : the list of corresponding OSM ids
-    """
-    ids = []
-    for landmark in landmarks :
-        ids.append(landmark.osm_id)
-
-    return ids
-
-def fetch_landmark(client, landmark_uuid: str):
-    """
-    Fetch landmark data from the API based on the landmark UUID.
-
-    Args:
-        landmark_uuid (str): The UUID of the landmark.
-
-    Returns:
-        dict: Landmark data fetched from the API.
-    """
-    response = client.get(f"/landmark/{landmark_uuid}")
-
-    if response.status_code != 200:
-        raise Exception(f"Failed to fetch landmark with UUID {landmark_uuid}: {response.status_code}")
-
-    json_data = response.json()
-
-    if "detail" in json_data:
-        raise Exception(json_data["detail"])
-
-    return json_data
-
-
-def load_trip_landmarks(client, first_uuid: str) -> List[Landmark]:
-    """
-    Load all landmarks for a trip using the response from the API.
-
-    Args:
-        first_uuid (str) : The first UUID of the landmark.
-
-    Returns:
-        landmarks (list) : An list containing all landmarks for the trip.
-    """
-    landmarks = []
-    next_uuid = first_uuid
-
-    while next_uuid is not None:
-        landmark_data = fetch_landmark(client, next_uuid)
-        # # Convert UUIDs to strings explicitly
-        # landmark_data = {
-        #     key: str(value) if isinstance(value, UUID) else value
-        #     for key, value in landmark_data.items()
-        # }
-        landmarks.append(Landmark(**landmark_data)) # Create Landmark objects
-        next_uuid = landmark_data.get('next_uuid')  # Prepare for the next iteration
-
-    return landmarks
-
-
-def log_trip_details(request, landmarks: List[Landmark], duration: int, target_duration: int) :
-    """
-    Allows to show the detailed trip in the html test report.
-    
-    Args:
-        request:
-        landmarks (list): the ordered list of visited landmarks 
-        duration (int): the total duration of this trip
-        target_duration(int): the target duration of this trip
-    """
-    trip_string = [f"{landmark.name} ({landmark.attractiveness} | {landmark.duration}) - {landmark.time_to_reach_next}" for landmark in landmarks]
-
-    # Pass additional info to pytest for reporting
-    request.node.trip_details = trip_string
-    request.node.trip_duration = str(duration)              # result['total_time']
-    request.node.target_duration = str(target_duration)
-
-
 # def test_new_trip_single_prefs(client):
 #     response = client.post(
 #         "/trip/new",
@@ -185,5 +87,4 @@ def log_trip_details(request, landmarks: List[Landmark], duration: int, target_d
 
 
 # def test_new_trip_matches_prefs(client):
-#     # todo
 #     pass
diff --git a/backend/src/tests/test_utils.py b/backend/src/tests/test_utils.py
new file mode 100644
index 0000000..94b1cb4
--- /dev/null
+++ b/backend/src/tests/test_utils.py
@@ -0,0 +1,89 @@
+"""Helper methods for testing."""
+from typing import List
+from fastapi import HTTPException
+
+from ..structs.landmark import Landmark
+
+
+def landmarks_to_osmid(landmarks: List[Landmark]) -> List[int] :
+    """
+    Convert the list of landmarks into a list containing their osm ids for quick landmark checking.
+    
+    Args :
+        landmarks (list): the list of landmarks
+    
+    Returns :
+        ids (list)      : the list of corresponding OSM ids
+    """
+    ids = []
+    for landmark in landmarks :
+        ids.append(landmark.osm_id)
+
+    return ids
+
+def fetch_landmark(client, landmark_uuid: str):
+    """
+    Fetch landmark data from the API based on the landmark UUID.
+
+    Args:
+        landmark_uuid (str): The UUID of the landmark.
+
+    Returns:
+        dict: Landmark data fetched from the API.
+    """
+    response = client.get(f"/landmark/{landmark_uuid}")
+
+    if response.status_code != 200:
+        raise HTTPException(status_code=999, detail=f"Failed to fetch landmark with UUID {landmark_uuid}: {response.status_code}")
+
+    json_data = response.json()
+
+    if "detail" in json_data:
+        raise HTTPException(status_code=999, detail=json_data["detail"])
+
+
+    return json_data
+
+
+def load_trip_landmarks(client, first_uuid: str) -> List[Landmark]:
+    """
+    Load all landmarks for a trip using the response from the API.
+
+    Args:
+        first_uuid (str) : The first UUID of the landmark.
+
+    Returns:
+        landmarks (list) : An list containing all landmarks for the trip.
+    """
+    landmarks = []
+    next_uuid = first_uuid
+
+    while next_uuid is not None:
+        landmark_data = fetch_landmark(client, next_uuid)
+        # # Convert UUIDs to strings explicitly
+        # landmark_data = {
+        #     key: str(value) if isinstance(value, UUID) else value
+        #     for key, value in landmark_data.items()
+        # }
+        landmarks.append(Landmark(**landmark_data)) # Create Landmark objects
+        next_uuid = landmark_data.get('next_uuid')  # Prepare for the next iteration
+
+    return landmarks
+
+
+def log_trip_details(request, landmarks: List[Landmark], duration: int, target_duration: int) :
+    """
+    Allows to show the detailed trip in the html test report.
+    
+    Args:
+        request:
+        landmarks (list): the ordered list of visited landmarks 
+        duration (int): the total duration of this trip
+        target_duration(int): the target duration of this trip
+    """
+    trip_string = [f"{landmark.name} ({landmark.attractiveness} | {landmark.duration}) - {landmark.time_to_reach_next}" for landmark in landmarks]
+
+    # Pass additional info to pytest for reporting
+    request.node.trip_details = trip_string
+    request.node.trip_duration = str(duration)              # result['total_time']
+    request.node.target_duration = str(target_duration)
