diff --git a/src/road_func.h b/src/road_func.h
index 151ae4e9fe..7303ebff30 100644
--- a/src/road_func.h
+++ b/src/road_func.h
@@ -28,16 +28,6 @@ static inline bool IsValidRoadType(RoadType rt)
 	return rt == ROADTYPE_ROAD || rt == ROADTYPE_TRAM;
 }
 
-/**
- * Are the given bits pointing to valid roadtypes?
- * @param rts the roadtypes to check for validness
- * @return true if and only if valid
- */
-static inline bool AreValidRoadTypes(RoadTypes rts)
-{
-	return HasBit(rts, ROADTYPE_ROAD) || HasBit(rts, ROADTYPE_TRAM);
-}
-
 /**
  * Maps a RoadType to the corresponding RoadTypes value
  *
diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index b871b49cd4..9e3e70cfae 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -1697,7 +1697,7 @@ CommandCost CmdBuildRoadStop(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
 
 	if (distant_join && (!_settings_game.station.distant_join_stations || !Station::IsValidID(station_to_join))) return CMD_ERROR;
 
-	if (!AreValidRoadTypes(rts) || !HasRoadTypesAvail(_current_company, rts)) return CMD_ERROR;
+	if (!HasExactlyOneBit(rts) || !HasRoadTypesAvail(_current_company, rts)) return CMD_ERROR;
 
 	/* Trams only have drive through stops */
 	if (!is_drive_through && HasBit(rts, ROADTYPE_TRAM)) return CMD_ERROR;
diff --git a/src/tunnelbridge_cmd.cpp b/src/tunnelbridge_cmd.cpp
index be686c05cf..4bfbf9b1b0 100644
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -207,7 +207,7 @@ CommandCost CmdBuildBridge(TileIndex end_tile, DoCommandFlag flags, uint32 p1, u
 	switch (transport_type) {
 		case TRANSPORT_ROAD:
 			roadtypes = (RoadTypes)GB(p2, 8, 2);
-			if (!AreValidRoadTypes(roadtypes) || !HasRoadTypesAvail(_current_company, roadtypes)) return CMD_ERROR;
+			if (!HasExactlyOneBit(roadtypes) || !HasRoadTypesAvail(_current_company, roadtypes)) return CMD_ERROR;
 			break;
 
 		case TRANSPORT_RAIL:
@@ -487,7 +487,7 @@ CommandCost CmdBuildTunnel(TileIndex start_tile, DoCommandFlag flags, uint32 p1,
 		if (!ValParamRailtype((RailType)p1)) return CMD_ERROR;
 	} else {
 		const RoadTypes rts = (RoadTypes)GB(p1, 0, 2);
-		if (!AreValidRoadTypes(rts) || !HasRoadTypesAvail(_current_company, rts)) return CMD_ERROR;
+		if (!HasExactlyOneBit(rts) || !HasRoadTypesAvail(_current_company, rts)) return CMD_ERROR;
 	}
 
 	uint start_z;