diff --git a/OpenRa.Game/PathSearch.cs b/OpenRa.Game/PathSearch.cs
index 02561b8ace..b2a8ec43fc 100755
--- a/OpenRa.Game/PathSearch.cs
+++ b/OpenRa.Game/PathSearch.cs
@@ -14,7 +14,6 @@ namespace OpenRa
 		public UnitMovementType umt;
 		Func<int2, bool> customBlock;
 		public bool checkForBlocked;
-		public bool ignoreTerrain;
 		public Actor ignoreBuilding;
 
 		public PathSearch()
@@ -40,9 +39,8 @@ namespace OpenRa
 			var p = queue.Pop();
 			cellInfo[ p.Location.X, p.Location.Y ].Seen = true;
 
-			if (!ignoreTerrain)
-				if (passableCost[(int)umt][p.Location.X, p.Location.Y] == float.PositiveInfinity)
-					return p.Location;
+			if (passableCost[(int)umt][p.Location.X, p.Location.Y] == float.PositiveInfinity)
+				return p.Location;
 					
 			foreach( int2 d in Util.directions )
 			{
@@ -51,17 +49,18 @@ namespace OpenRa
 				if (!Game.world.Map.IsInMap(newHere.X, newHere.Y)) continue;
 				if( cellInfo[ newHere.X, newHere.Y ].Seen )
 					continue;
-				
-				if (!ignoreTerrain)
-				{
-					if (passableCost[(int)umt][newHere.X, newHere.Y] == float.PositiveInfinity)
-						continue;
-					if (!Game.world.BuildingInfluence.CanMoveHere(newHere) && 
-						Game.world.BuildingInfluence.GetBuildingAt(newHere) != ignoreBuilding)
-						continue;
-					if (Game.world.Map.IsOverlaySolid(newHere))
-						continue;
-				}
+
+				var custom = Game.world.customTerrain[newHere.X, newHere.Y];
+				if (custom != null
+					&& custom.GetCost(newHere, umt) == float.PositiveInfinity)
+					continue;
+				if (passableCost[(int)umt][newHere.X, newHere.Y] == float.PositiveInfinity)
+					continue;
+				if (!Game.world.BuildingInfluence.CanMoveHere(newHere) && 
+					Game.world.BuildingInfluence.GetBuildingAt(newHere) != ignoreBuilding)
+					continue;
+				if (Game.world.Map.IsOverlaySolid(newHere))
+					continue;
 				
 				// Replicate real-ra behavior of not being able to enter a cell if there is a mixture of crushable and uncrushable units
 				if (checkForBlocked && (Game.world.UnitInfluence.GetUnitsAt(newHere).Any(a => !Game.world.IsActorPathableToCrush(a, umt))))
@@ -69,14 +68,15 @@ namespace OpenRa
 				
 				if (customBlock != null && customBlock(newHere))
 					continue;
-
 				
 				var est = heuristic( newHere );
 				if( est == float.PositiveInfinity )
 					continue;
 
-				float cellCost = ( ( d.X * d.Y != 0 ) ? 1.414213563f : 1.0f ) * 
-					(ignoreTerrain ? 1 : passableCost[ (int)umt ][ newHere.X, newHere.Y ]);
+				float cellCost = ((d.X * d.Y != 0) ? 1.414213563f : 1.0f) *
+					(custom != null
+						? custom.GetCost(newHere, umt) :
+						passableCost[(int)umt][newHere.X, newHere.Y]);
 				float newCost = cellInfo[ p.Location.X, p.Location.Y ].MinCost + cellCost;
 
 				if( newCost >= cellInfo[ newHere.X, newHere.Y ].MinCost )
diff --git a/OpenRa.Game/Traits/Bridge.cs b/OpenRa.Game/Traits/Bridge.cs
index cda11d1923..f00434601e 100644
--- a/OpenRa.Game/Traits/Bridge.cs
+++ b/OpenRa.Game/Traits/Bridge.cs
@@ -9,12 +9,12 @@ using System.Drawing;
 
 namespace OpenRa.Traits
 {
-	class BridgeInfo : ITraitInfo
+	class BridgeInfo : OwnedActorInfo, ITraitInfo
 	{
 		public object Create(Actor self) { return new Bridge(self); }
 	}
 
-	class Bridge : IRender, ITick, ICustomTerrain
+	class Bridge : IRender, ICustomTerrain
 	{
 		Dictionary<int2, int> Tiles;
 		TileTemplate Template;
@@ -34,8 +34,6 @@ namespace OpenRa.Traits
 				yield return new Renderable(t.Value, Game.CellSize * t.Key, PaletteType.Gold);
 		}
 
-		public void Tick(Actor self) {}
-
 		public void SetTiles(TileTemplate template, Dictionary<int2, int> replacedTiles)
 		{
 			Template = template;
@@ -49,10 +47,10 @@ namespace OpenRa.Traits
 				a => Sprites[new TileReference { tile = (ushort)template.Index, image = (byte)a.Value }]);
 		}
 
-		public double GetCost(int2 p, UnitMovementType umt)
+		public float GetCost(int2 p, UnitMovementType umt)
 		{
 			var origTile = Tiles[p];	// if this explodes, then SetTiles did something horribly wrong.
-			return 1.0;
+			return float.PositiveInfinity;
 		}
 	}
 }
diff --git a/OpenRa.Game/Traits/TraitsInterfaces.cs b/OpenRa.Game/Traits/TraitsInterfaces.cs
index 51f401d358..ad2094dc40 100644
--- a/OpenRa.Game/Traits/TraitsInterfaces.cs
+++ b/OpenRa.Game/Traits/TraitsInterfaces.cs
@@ -25,7 +25,7 @@ namespace OpenRa.Traits
 	public interface IAcceptThief { void OnSteal(Actor self, Actor thief); }
 	public interface IAcceptSpy { void OnInfiltrate(Actor self, Actor spy); }
 
-	public interface ICustomTerrain { double GetCost(int2 p, UnitMovementType umt); }
+	public interface ICustomTerrain { float GetCost(int2 p, UnitMovementType umt); }
 
 	interface IProducer
 	{