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diff --git a/src/script/api/script_sign.hpp b/src/script/api/script_sign.hpp
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+++ b/src/script/api/script_sign.hpp
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+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD 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. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file script_sign.hpp Everything to query and build signs. */
+
+#ifndef SCRIPT_SIGN_HPP
+#define SCRIPT_SIGN_HPP
+
+#include "script_error.hpp"
+
+/**
+ * Class that handles all sign related functions.
+ */
+class AISign : public AIObject {
+public:
+	/**
+	 * All sign related error messages.
+	 */
+	enum ErrorMessages {
+
+		/** Base for sign building related errors */
+		ERR_SIGN_BASE = AIError::ERR_CAT_SIGN << AIError::ERR_CAT_BIT_SIZE,
+
+		/** Too many signs have been placed */
+		ERR_SIGN_TOO_MANY_SIGNS,             // [STR_ERROR_TOO_MANY_SIGNS]
+	};
+
+	/**
+	 * Checks whether the given sign index is valid.
+	 * @param sign_id The index to check.
+	 * @return True if and only if the sign is valid.
+	 */
+	static bool IsValidSign(SignID sign_id);
+
+	/**
+	 * Set the name of a sign.
+	 * @param sign_id The sign to set the name for.
+	 * @param name The name for the sign.
+	 * @pre IsValidSign(sign_id).
+	 * @pre 'name' must have at least one character.
+	 * @pre 'name' must have at most 30 characters.
+	 * @exception AIError::ERR_NAME_IS_NOT_UNIQUE
+	 * @return True if and only if the name was changed.
+	 */
+	static bool SetName(SignID sign_id, const char *name);
+
+	/**
+	 * Get the name of the sign.
+	 * @param sign_id The sign to get the name of.
+	 * @pre IsValidSign(sign_id).
+	 * @return The name of the sign.
+	 */
+	static char *GetName(SignID sign_id);
+
+	/**
+	 * Gets the location of the sign.
+	 * @param sign_id The sign to get the location of.
+	 * @pre IsValidSign(sign_id).
+	 * @return The location of the sign.
+	 */
+	static TileIndex GetLocation(SignID sign_id);
+
+	/**
+	 * Builds a sign on the map.
+	 * @param location The place to build the sign.
+	 * @param text The text to place on the sign.
+	 * @pre AIMap::IsValidTile(location).
+	 * @pre 'text' must have at least one character.
+	 * @pre 'text' must have at most 30 characters.
+	 * @exception AISign::ERR_SIGN_TOO_MANY_SIGNS
+	 * @return The SignID of the build sign (use IsValidSign() to check for validity).
+	 *   In test-mode it returns 0 if successful, or any other value to indicate
+	 *   failure.
+	 */
+	static SignID BuildSign(TileIndex location, const char *text);
+
+	/**
+	 * Removes a sign from the map.
+	 * @param sign_id The sign to remove.
+	 * @pre IsValidSign(sign_id).
+	 * @return True if and only if the sign has been removed.
+	 */
+	static bool RemoveSign(SignID sign_id);
+};
+
+#endif /* SCRIPT_SIGN_HPP */