sigc::signal<void, Route &> signal_route_added;
sigc::signal<void, Route &> signal_route_removed;
sigc::signal<void, Zone &> signal_zone_added;
sigc::signal<void, Route &> signal_route_added;
sigc::signal<void, Route &> signal_route_removed;
sigc::signal<void, Zone &> signal_zone_added;