diff --git a/src/micropolisj/engine/MapScanner.java b/src/micropolisj/engine/MapScanner.java
index 619f56f..f921271 100644
--- a/src/micropolisj/engine/MapScanner.java
+++ b/src/micropolisj/engine/MapScanner.java
@@ -72,7 +72,7 @@ class MapScanner
 				setZonePower();
 			}
 
-			if (cchr9 >= ROADBASE && cchr9 < POWERBASE)
+			if (isRoad(cchr))
 			{
 				doRoad();
 				return;
@@ -84,7 +84,7 @@ class MapScanner
 				return;
 			}
 
-			if (cchr9 >= RAILBASE && cchr9 < RESBASE)
+			if (isRail(cchr))
 			{
 				doRail();
 				return;
diff --git a/src/micropolisj/engine/TileConstants.java b/src/micropolisj/engine/TileConstants.java
index 3c04873..7da0da3 100644
--- a/src/micropolisj/engine/TileConstants.java
+++ b/src/micropolisj/engine/TileConstants.java
@@ -324,4 +324,16 @@ public class TileConstants
 	{
 		return (tile == DIRT || ((tile & BULLBIT) != 0 && (tile & BURNBIT) != 0));
 	}
+
+	public static boolean isRoad(int tile)
+	{
+		int tmp = tile & LOMASK;
+		return (tmp >= ROADBASE && tmp < POWERBASE);
+	}
+
+	public static boolean isRail(int tile)
+	{
+		int tmp = tile & LOMASK;
+		return (tmp >= RAILBASE && tmp < RESBASE);
+	}
 }