diff --git a/OpenRa.Game/OpenRa.Game.csproj b/OpenRa.Game/OpenRa.Game.csproj
index e119666366..31aed69f6c 100644
--- a/OpenRa.Game/OpenRa.Game.csproj
+++ b/OpenRa.Game/OpenRa.Game.csproj
@@ -70,6 +70,7 @@
     <Compile Include="Sprite.cs" />
     <Compile Include="SpriteRenderer.cs" />
     <Compile Include="SpriteSheetBuilder.cs" />
+    <Compile Include="TerrainCosts.cs" />
     <Compile Include="TerrainRenderer.cs" />
     <Compile Include="Tree.cs" />
     <Compile Include="TreeCache.cs" />
diff --git a/OpenRa.Game/PathFinder.cs b/OpenRa.Game/PathFinder.cs
index 654f9f8793..b79cb84139 100644
--- a/OpenRa.Game/PathFinder.cs
+++ b/OpenRa.Game/PathFinder.cs
@@ -11,34 +11,19 @@ namespace OpenRa.Game
 	{
 		public static PathFinder Instance;
 
-		bool[ , ] passable = new bool[ 128, 128 ];
+		double[ , ] passableCost = new double[ 128, 128 ];
 		Map map;
 
-		static bool IsPassable(int terrainType)
-		{
-			switch (terrainType)
-			{
-				case 0:
-				case 2:
-				case 6:
-				case 8:
-				case 9:
-					return true;
-				default:
-					return false;
-			}
-		}
-
 		public PathFinder(Map map, TileSet tileSet)
 		{
 			this.map = map;
 
-			//todo: speed hax for roads
+			for( int x = 0 ; x < 128 ; x++ )
+				for( int y = 0 ; y < 128 ; y++ )
 
-			for (int x = 0; x < 128; x++)
-				for (int y = 0; y < 128; y++)
-					passable[x, y] = map.IsInMap(x, y) && 
-						IsPassable(tileSet.GetWalkability(map.MapTiles[x, y]));
+					passableCost[ x, y ] = ( map.IsInMap( x, y ) )
+						? TerrainCosts.Cost( UnitMovementType.Wheel, tileSet.GetWalkability( map.MapTiles[ x, y ] ) )
+						: double.PositiveInfinity;
 		}
 
 		public List<int2> FindUnitPath( World world, Unit unit, int2 destination )
@@ -83,13 +68,14 @@ namespace OpenRa.Game
 						++seenCount;
 						continue;
 					}
-					if( !passable[ newHere.X, newHere.Y ] )
+					if( passableCost[ newHere.X, newHere.Y ] == double.PositiveInfinity )
 					{
 						++impassableCount;
 						continue;
 					}
 
-					double newCost = cellInfo[ here.X, here.Y ].MinCost + ( ( d.X * d.Y != 0 ) ? 1.414213563 : 1.0 );
+					double cellCost = ( ( d.X * d.Y != 0 ) ? 1.414213563 : 1.0 ) * passableCost[ newHere.X, newHere.Y ];
+					double newCost = cellInfo[ here.X, here.Y ].MinCost + cellCost;
 
 					if( newCost >= cellInfo[ newHere.X, newHere.Y ].MinCost )
 						continue;
diff --git a/OpenRa.Game/TerrainCosts.cs b/OpenRa.Game/TerrainCosts.cs
new file mode 100644
index 0000000000..62f17c6db8
--- /dev/null
+++ b/OpenRa.Game/TerrainCosts.cs
@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OpenRa.FileFormats;
+using System.IO;
+
+namespace OpenRa.Game
+{
+	enum UnitMovementType : byte
+	{
+		Foot = 0,
+		Track = 1,
+		Wheel = 2,
+		Float = 3,
+	}
+
+	enum TerrainMovementType : byte
+	{
+		Clear = 0,
+		Water = 1,
+		Road = 2,
+		Rock = 3,
+		//Tree = 4,
+		River = 5,
+		Rough = 6,
+		Wall = 7,
+		Beach = 8,
+		Ore = 9,
+	}
+
+	static class TerrainCosts
+	{
+		static double[][] costs = Util.MakeArray<double[]>( 4,
+			delegate { return Util.MakeArray<double>( 10,
+				delegate { return double.PositiveInfinity; } ); } );
+
+		static TerrainCosts()
+		{
+			IniFile file = new IniFile( File.OpenRead( "../../../rules.ini" ) );
+
+			for( int i = 0 ; i < 10 ; i++ )
+			{
+				if( i == 4 )
+					continue;
+				IniSection section = file.GetSection( ( (TerrainMovementType)i ).ToString() );
+				for( int j = 0 ; j < 4 ; j++ )
+				{
+					string val = section.GetValue( ( (UnitMovementType)j ).ToString(), "0%" );
+					costs[ j ][ i ] = 100.0 / double.Parse( val.Substring( 0, val.Length - 1 ) );
+				}
+			}
+		}
+
+		public static double Cost( UnitMovementType unitMovementType, int r )
+		{
+			return costs[ (byte)unitMovementType ][ r ];
+		}
+	}
+}