copyWith method
      
RouteExitSign
copyWith({ 
    
    
- RouteExitSignType? type,
- RouteExitSignTable? roadNameTable,
- Optional<RouteExitSignTable?> ? roadNumberTable,
Implementation
RouteExitSign copyWith({
  RouteExitSignType? type,
  RouteExitSignTable? roadNameTable,
  Optional<RouteExitSignTable?>? roadNumberTable
}) {
  return RouteExitSign(
    type: type ?? this.type,
    roadNameTable: roadNameTable ?? this.roadNameTable,
    roadNumberTable: roadNumberTable != null ? roadNumberTable.value : this.roadNumberTable
  );
}