Add fetching of the free flow speed data

src/utils/api-client.js

@@ -18,7 +18,35 @@ export function get_lam_points(api_url, set_state) {
         return { ...prevState, lam_points };
       });
     })
-    .then(() => get_lam_station_data(api_url, set_state))
+    .then(() => {
+      return Promise.all([
+        get_lam_station_data(api_url, set_state),
+        get_free_flow_speeds(api_url, set_state),
+      ]);
+    })
+    .catch(e => (console.error(e)));
+}
+
+export function get_free_flow_speeds(api_url, set_state) {
+  return fetch(`${api_url}/api/v1/data/free-flow-speeds`)
+    .then((res) => res.json())
+    .then((json) => {
+      const tms_data = json.tmsFreeFlowSpeeds;
+      set_state((prevState) => {
+        let lam_points = prevState.lam_points;
+        for (let data of tms_data) {
+          let id = data.id;
+          let point = lam_points.get(id);
+          if (!point) {
+            continue;
+          }
+          point.set_free_flow_speed_dir1(data.freeFlowSpeed1);
+          point.set_free_flow_speed_dir2(data.freeFlowSpeed2);
+          lam_points = lam_points.set(id, point);
+        }
+        return { ...prevState, lam_points };
+      });
+    })
     .catch(e => (console.error(e)));
 }