static inline RoadTypeIdentifier GetRoadTypeRoad(TileIndex t)
{
	return RoadTypeIdentifier(ROADTYPE_ROAD, (RoadSubType)GB(_m[t].m4, 0, 4));
}

static inline RoadTypeIdentifier GetRoadTypeTram(TileIndex t)
{
	return RoadTypeIdentifier(ROADTYPE_TRAM, (RoadSubType)GB(_m[t].m4, 4, 4));
}

/**********************/


struct RoadTypeIdentifiers {
	RoadTypeIdentifier road_identifier = RoadTypeIdentifier(INVALID_ROADTYPE, INVALID_ROADSUBTYPE);
	RoadTypeIdentifier tram_identifier = RoadTypeIdentifier(INVALID_ROADTYPE, INVALID_ROADSUBTYPE);

	RoadTypeIdentifiers(TileIndex t) {
		if (GetRoadBits(t, ROADTYPE_ROAD) != ROAD_NONE) {
			road_identifier = GetRoadTypeRoad(t);
		}

		if (GetRoadBits(t, ROADTYPE_TRAM) != ROAD_NONE) {
			road_identifier = GetRoadTypeTram(t);
		}
	}
};