Index: src/uk/me/parabola/mkgmap/osmstyle/function/MaxSpeedKmhFunction.java
===================================================================
--- src/uk/me/parabola/mkgmap/osmstyle/function/MaxSpeedKmhFunction.java	(revision 0)
+++ src/uk/me/parabola/mkgmap/osmstyle/function/MaxSpeedKmhFunction.java	(revision 0)
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2013.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 or
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+package uk.me.parabola.mkgmap.osmstyle.function;
+
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
+import java.util.Locale;
+import java.util.regex.Pattern;
+
+import uk.me.parabola.mkgmap.reader.osm.Element;
+
+/**
+ * Returns the maxspeed converted to km/h.
+ * @author WanMil
+ */
+public class MaxSpeedKmhFunction extends CachedFunction {
+	private static final Pattern ENDS_IN_MPH_PATTERN = Pattern.compile(".*mph");
+	private static final Pattern REMOVE_MPH_PATTERN = Pattern.compile("[ \t]*mph");
+	private static final Pattern REMOVE_KMH_PATTERN = Pattern.compile("[ \t]*kmh");
+
+	private final DecimalFormat nf = new DecimalFormat("0.0#", DecimalFormatSymbols.getInstance(Locale.US));
+
+	public MaxSpeedKmhFunction() {
+		// requires maxspeed
+		super("maxspeed");
+	}
+
+	protected String calcImpl(Element el) {
+		String tagValue = el.getTag("maxspeed");
+		if (tagValue == null) {
+			return null;
+		}
+		double factor = 1.0;
+		
+		String speedTag = tagValue.toLowerCase().trim();
+		
+		if (ENDS_IN_MPH_PATTERN.matcher(speedTag).matches()) {
+			// Check if it is a limit in mph
+			speedTag = REMOVE_MPH_PATTERN.matcher(speedTag).replaceFirst("");
+			factor = 1.61;
+		} else
+			speedTag = REMOVE_KMH_PATTERN.matcher(speedTag).replaceFirst("");  // get rid of kmh just in case
+
+		double kmh;
+		try {
+			kmh = Integer.parseInt(speedTag) * factor;
+		} catch (Exception e) {
+			return null;
+		}		
+		
+		return nf.format(kmh);
+	}
+
+	public String getName() {
+		return "maxspeedkmh";
+	}
+
+	public boolean supportsWay() {
+		return true;
+	}
+}
Index: src/uk/me/parabola/mkgmap/osmstyle/function/FunctionFactory.java
===================================================================
--- src/uk/me/parabola/mkgmap/osmstyle/function/FunctionFactory.java	(revision 2673)
+++ src/uk/me/parabola/mkgmap/osmstyle/function/FunctionFactory.java	(working copy)
@@ -38,6 +38,8 @@
 		}
 		if ("area_size".equals(name))
 			return new AreaSizeFunction();
+		if ("maxspeedkmh".equals(name))
+			return new MaxSpeedKmhFunction();
 		
 		return null;
 	}