Copenhagen offers an efficient, eco-friendly public transport network including metro, buses, trains, harbor buses, and extensive bike lanes. The Metro runs 24/7 across four lines, while buses (A, S, and night N buses) cover the entire city. S-trains connect suburbs, and harbor buses serve key waterfront spots. All systems use a unified ticket (City Pass or Copenhagen Card) and are accessible via the DOT app. The city is also bike-friendly with widespread rentals and dedicated bike lanes.