Implement road ground types for road waypoints

docs/landscape.html

@@ -907,6 +907,22 @@
      <li>m2: index into the array of stations</li>
      <li>m3 bits 7..4: persistent random data for railway stations/waypoints and airports)</li>
      <li>m3 bits 7..4: <a href="#OwnershipInfo">owner</a> of tram tracks (road stop)</li>
+   <li style="color: blue">m3 bits 3..2: ground type (road waypoints)
+    <table>
+     <tr>
+      <td><tt>0</tt>&nbsp; </td>
+      <td>on bare land</td>
+     </tr>
+     <tr>
+      <td><tt>1</tt>&nbsp; </td>
+      <td>on grass</td>
+     </tr>
+     <tr>
+      <td><tt>2</tt>&nbsp; </td>
+      <td>paved</td>
+     </tr>
+    </table>
+   </li>
      <li style="color: blue">m3 bits 1..0: bits to disallow vehicles to go a specific direction (drive-through road stop)
       <table>
        <tr>
@@ -1037,6 +1053,7 @@
 
      <li>m7 bits 4..0: <a href="#OwnershipInfo">owner</a> of road (road stops)</li>
      <li>m7: animation frame (railway stations/waypoints, airports)</li>
+     <li style="color: blue">m8 bit 15: Snow or desert present (road waypoints)</li>
      <li style="color: blue">m8 bits 14..12: <a href="#RoadCachedOneWayState">Road cached one way state</a></li>
      <li>m8 bits 11..6: <a href="#TramType">Tramtype</a></li>
      <li>m8 bits 5..0: <a href="#TrackType">track type</a> for railway stations/waypoints</li>