Paris boasts one of the most dense and efficient public transportation networks in the world, making it exceptionally easy to navigate without a car. The centerpiece is the Metro, which has 16 lines and over 300 stations; it is said that you are never more than 500 meters from a Metro station anywhere in the city proper. Supplementing this is the RER (Regional Express Network), which connects the city center to the suburbs and major hubs like Disneyland Paris and Charles de Gaulle Airport. The system is color-coded and well-signed, though it can be intimidating during rush hour. For travelers, the "Navigo" pass or the "Paris Visite" ticket are popular options, though many locals now use smartphone apps for contactless entry. While the system is old and not always perfectly accessible for those with limited mobility (due to many stairs), its frequency and coverage are world-class.