diff --git a/src/clear_cmd.cpp b/src/clear_cmd.cpp
index 43f820d6b0..e3d1e3137c 100644
--- a/src/clear_cmd.cpp
+++ b/src/clear_cmd.cpp
@@ -63,19 +63,14 @@ void DrawHillyLandTile(const TileInfo *ti)
 
 void DrawClearLandFence(const TileInfo *ti)
 {
-	byte z = ti->z;
-
-	if (ti->tileh & SLOPE_S) {
-		z += TILE_HEIGHT;
-		if (ti->tileh == SLOPE_STEEP_S) z += TILE_HEIGHT;
-	}
+	int z = GetSlopeZInCorner(ti->tileh, CORNER_S);
 
 	if (GetFenceSW(ti->tile) != 0) {
-		DrawGroundSpriteAt(_clear_land_fence_sprites[GetFenceSW(ti->tile) - 1] + _fence_mod_by_tileh_sw[ti->tileh], PAL_NONE, ti->x, ti->y, z);
+		DrawGroundSpriteAt(_clear_land_fence_sprites[GetFenceSW(ti->tile) - 1] + _fence_mod_by_tileh_sw[ti->tileh], PAL_NONE, 0, 0, z);
 	}
 
 	if (GetFenceSE(ti->tile) != 0) {
-		DrawGroundSpriteAt(_clear_land_fence_sprites[GetFenceSE(ti->tile) - 1] + _fence_mod_by_tileh_se[ti->tileh], PAL_NONE, ti->x, ti->y, z);
+		DrawGroundSpriteAt(_clear_land_fence_sprites[GetFenceSE(ti->tile) - 1] + _fence_mod_by_tileh_se[ti->tileh], PAL_NONE, 0, 0, z);
 	}
 }
 
diff --git a/src/dummy_land.cpp b/src/dummy_land.cpp
index 305be368c6..0490fc2931 100644
--- a/src/dummy_land.cpp
+++ b/src/dummy_land.cpp
@@ -19,7 +19,7 @@
 
 static void DrawTile_Dummy(TileInfo *ti)
 {
-	DrawGroundSpriteAt(SPR_SHADOW_CELL, PAL_NONE, ti->x, ti->y, ti->z);
+	DrawGroundSprite(SPR_SHADOW_CELL, PAL_NONE);
 }
 
 
diff --git a/src/road_cmd.cpp b/src/road_cmd.cpp
index 4ef98fc5ea..5a5e96257b 100644
--- a/src/road_cmd.cpp
+++ b/src/road_cmd.cpp
@@ -1126,7 +1126,7 @@ static void DrawRoadBits(TileInfo *ti)
 	if (road != ROAD_NONE) {
 		DisallowedRoadDirections drd = GetDisallowedRoadDirections(ti->tile);
 		if (drd != DRD_NONE) {
-			DrawRoadDetail(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), ti, 8, 8, 0);
+			DrawGroundSpriteAt(SPR_ONEWAY_BASE + drd - 1 + ((road == ROAD_X) ? 0 : 3), PAL_NONE, 8, 8, GetPartialZ(8, 8, ti->tileh));
 		}
 	}
 
diff --git a/src/tunnelbridge_cmd.cpp b/src/tunnelbridge_cmd.cpp
index 42e18201b7..0b199bb4e8 100644
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -1184,7 +1184,7 @@ void DrawBridgeMiddle(const TileInfo *ti)
 				pal = PALETTE_TO_TRANSPARENT;
 			}
 
-			DrawGroundSpriteAt(image, pal, x, y, z);
+			DrawGroundSpriteAt(image, pal, x - ti->x, y - ti->y, z - ti->z);
 		}
 	} else if (_settings_client.gui.bridge_pillars) {
 		/* draw pillars below for high bridges */
diff --git a/src/viewport.cpp b/src/viewport.cpp
index 2e7753b445..7b417f942e 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -467,7 +467,7 @@ void HandleZoomMessage(Window *w, const ViewPort *vp, byte widget_zoom_in, byte
 }
 
 /**
- * Draws a ground sprite at a specific world-coordinate.
+ * Shedules a tile sprite for drawing.
  *
  * @param image the image to draw.
  * @param pal the provided palette.
@@ -477,9 +477,8 @@ void HandleZoomMessage(Window *w, const ViewPort *vp, byte widget_zoom_in, byte
  * @param sub Only draw a part of the sprite.
  * @param extra_offs_x Pixel X offset for the sprite position.
  * @param extra_offs_y Pixel Y offset for the sprite position.
- *
  */
-void DrawGroundSpriteAt(SpriteID image, SpriteID pal, int32 x, int32 y, byte z, const SubSprite *sub, int extra_offs_x, int extra_offs_y)
+static void AddTileSpriteToDraw(SpriteID image, SpriteID pal, int32 x, int32 y, int z, const SubSprite *sub = NULL, int extra_offs_x = 0, int extra_offs_y = 0)
 {
 	assert((image & SPRITE_MASK) < MAX_SPRITES);
 
@@ -520,6 +519,32 @@ static void AddChildSpriteToFoundation(SpriteID image, SpriteID pal, const SubSp
 	_vd.last_child = old_child;
 }
 
+/**
+ * Draws a ground sprite at a specific world-coordinate relative to the current tile.
+ * If the current tile is drawn on top of a foundation the sprite is added as child sprite to the "foundation"-ParentSprite.
+ *
+ * @param image the image to draw.
+ * @param pal the provided palette.
+ * @param x position x (world coordinates) of the sprite relative to current tile.
+ * @param y position y (world coordinates) of the sprite relative to current tile.
+ * @param z position z (world coordinates) of the sprite relative to current tile.
+ * @param sub Only draw a part of the sprite.
+ * @param extra_offs_x Pixel X offset for the sprite position.
+ * @param extra_offs_y Pixel Y offset for the sprite position.
+ */
+void DrawGroundSpriteAt(SpriteID image, SpriteID pal, int32 x, int32 y, int z, const SubSprite *sub, int extra_offs_x, int extra_offs_y)
+{
+	/* Switch to first foundation part, if no foundation was drawn */
+	if (_vd.foundation_part == FOUNDATION_PART_NONE) _vd.foundation_part = FOUNDATION_PART_NORMAL;
+
+	if (_vd.foundation[_vd.foundation_part] != -1) {
+		Point pt = RemapCoords(x, y, z);
+		AddChildSpriteToFoundation(image, pal, sub, _vd.foundation_part, pt.x + extra_offs_x, pt.y + extra_offs_y);
+	} else {
+		AddTileSpriteToDraw(image, pal, _cur_ti->x + x, _cur_ti->y + y, _cur_ti->z + z, sub, extra_offs_x, extra_offs_y);
+	}
+}
+
 /**
  * Draws a ground sprite for the current tile.
  * If the current tile is drawn on top of a foundation the sprite is added as child sprite to the "foundation"-ParentSprite.
@@ -532,17 +557,9 @@ static void AddChildSpriteToFoundation(SpriteID image, SpriteID pal, const SubSp
  */
 void DrawGroundSprite(SpriteID image, SpriteID pal, const SubSprite *sub, int extra_offs_x, int extra_offs_y)
 {
-	/* Switch to first foundation part, if no foundation was drawn */
-	if (_vd.foundation_part == FOUNDATION_PART_NONE) _vd.foundation_part = FOUNDATION_PART_NORMAL;
-
-	if (_vd.foundation[_vd.foundation_part] != -1) {
-		AddChildSpriteToFoundation(image, pal, sub, _vd.foundation_part, extra_offs_x, extra_offs_y);
-	} else {
-		DrawGroundSpriteAt(image, pal, _cur_ti->x, _cur_ti->y, _cur_ti->z, sub, extra_offs_x, extra_offs_y);
-	}
+	DrawGroundSpriteAt(image, pal, 0, 0, 0, sub, extra_offs_x, extra_offs_y);
 }
 
-
 /**
  * Called when a foundation has been drawn for the current tile.
  * Successive ground sprites for the current tile will be drawn as child sprites of the "foundation"-ParentSprite, not as TileSprites.
@@ -805,7 +822,7 @@ static void DrawSelectionSprite(SpriteID image, SpriteID pal, const TileInfo *ti
 	/* FIXME: This is not totally valid for some autorail highlights, that extent over the edges of the tile. */
 	if (_vd.foundation[foundation_part] == -1) {
 		/* draw on real ground */
-		DrawGroundSpriteAt(image, pal, ti->x, ti->y, ti->z + z_offset);
+		AddTileSpriteToDraw(image, pal, ti->x, ti->y, ti->z + z_offset);
 	} else {
 		/* draw on top of foundation */
 		AddChildSpriteToFoundation(image, pal, NULL, foundation_part, 0, -z_offset);
@@ -1024,7 +1041,7 @@ static void ViewportAddLandscape()
 					if (x_cur == ((int)MapMaxX() - 1) * TILE_SIZE || y_cur == ((int)MapMaxY() - 1) * TILE_SIZE) {
 						uint maxh = max<uint>(TileHeight(tile), 1);
 						for (uint h = 0; h < maxh; h++) {
-							DrawGroundSpriteAt(SPR_SHADOW_CELL, PAL_NONE, ti.x, ti.y, h * TILE_HEIGHT);
+							AddTileSpriteToDraw(SPR_SHADOW_CELL, PAL_NONE, ti.x, ti.y, h * TILE_HEIGHT);
 						}
 					}
 
diff --git a/src/viewport_func.h b/src/viewport_func.h
index f749e80ff9..e025f1c8a2 100644
--- a/src/viewport_func.h
+++ b/src/viewport_func.h
@@ -46,7 +46,7 @@ static inline void MaxZoomInOut(int how, Window *w)
 void OffsetGroundSprite(int x, int y);
 
 void DrawGroundSprite(SpriteID image, SpriteID pal, const SubSprite *sub = NULL, int extra_offs_x = 0, int extra_offs_y = 0);
-void DrawGroundSpriteAt(SpriteID image, SpriteID pal, int32 x, int32 y, byte z, const SubSprite *sub = NULL, int extra_offs_x = 0, int extra_offs_y = 0);
+void DrawGroundSpriteAt(SpriteID image, SpriteID pal, int32 x, int32 y, int z, const SubSprite *sub = NULL, int extra_offs_x = 0, int extra_offs_y = 0);
 void AddSortableSpriteToDraw(SpriteID image, SpriteID pal, int x, int y, int w, int h, int dz, int z, bool transparent = false, int bb_offset_x = 0, int bb_offset_y = 0, int bb_offset_z = 0, const SubSprite *sub = NULL);
 void AddChildSpriteScreen(SpriteID image, SpriteID pal, int x, int y, bool transparent = false, const SubSprite *sub = NULL);
 void ViewportAddString(const DrawPixelInfo *dpi, ZoomLevel small_from, const ViewportSign *sign, StringID string_normal, StringID string_small, StringID string_small_shadow, uint64 params_1, uint64 params_2 = 0, Colours colour = INVALID_COLOUR);