diff --git a/src/roadveh_cmd.cpp b/src/roadveh_cmd.cpp
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -485,6 +485,8 @@ int32 CmdTurnRoadVeh(TileIndex tile, uin
 		return CMD_ERROR;
 	}
 
+	if (GetDisallowedRoadDirections(v->tile) != DRD_NONE) return CMD_ERROR;
+
 	if (IsTunnelTile(v->tile) && DirToDiagDir(v->direction) == GetTunnelDirection(v->tile)) return CMD_ERROR;
 	if (IsBridgeTile(v->tile) && DirToDiagDir(v->direction) == GetBridgeRampDirection(v->tile)) return CMD_ERROR;
 
@@ -1415,6 +1417,9 @@ again:
 					v->cur_speed = 0;
 					return;
 				}
+			} else if (GetDisallowedRoadDirections(v->tile) != DRD_NONE) {
+				v->cur_speed = 0;
+				return;
 			} else {
 				tile = v->tile;
 			}