Add road stop flag to not show one-way road overlays

docs/newgrf-roadstops-nml.html

@@ -70,7 +70,9 @@
 		<tr><td>animation_triggers</td><td>bitmask(ANIM_TRIGGER_ROAD_STOP_XXX, ...)</td><td>Bitmask of triggers that will trigger the <span class="code">anim_control</span> callback, see the <a href="#roadstop_anim_triggers">table</a> below.</td></tr>
 		<tr><td>general_flags</td><td>bitmask(RST_GENERAL_FLAG_XXX, ...)</td><td>
 			<p><b>RST_GENERAL_FLAG_RANDOM_ANIMATION</b><br />
-			<span class="indent">animation callback requires random bits in variable <span class="code">extra_callback_info1</span>.</span></p>
+			<span class="indent">Animation callback requires random bits in variable <span class="code">extra_callback_info1</span>.</span></p>
+			<p><b>RST_GENERAL_FLAG_NO_ONE_WAY_OVERLAY</b><br />
+			<span class="indent">Do not show one way road overlay sprites, this should only be set if different graphics are provided for the different one-way states using the <span class="code">one_way_info</span> variable.</span></p>
 		</td></tr>
 		<tr><td>minimum_bridge_height</td><td>Array of 6 items [0..255, ...]</td><td>Minimum clearances required for a bridge for each of the <a href="#roadstop_views">6 views/rotations</a> (or 0 to not allow any bridge). Values are given in height level units (1 level == 8px).</td></tr>
 		<tr><td>disallowed_bridge_pillars</td><td>Array of 6 items [bitmask(RST_BRIDGE_PILLAR_FLAG_, ...), ...]</td><td>

docs/newgrf-roadstops.html

@@ -148,6 +148,7 @@
 	<table>
 	<tr><th>Bit</th><th>Value</th><th>Meaning</th></tr>
 	<tr><td>0</td><td>1</td><td>Callback 141 needs random bits in variable 10</td></tr>
+	<tr><td>1</td><td>2</td><td>Do not show one way road overlay sprites, this should only be set if different graphics are provided for the different one-way states using bits 0..1 of variable 50.</td></tr>
 	</table>
 	The default value is 0 (no flags enabled).
 	</p>