The capital of Spain for over 400 years, Madrid is one of Europe's most prominent cities. Walking in Madrid is the best way to discover the city and in Madrid, it is a way of life. In the throes of a makeover, the city is undergoing renovation. When air pollution exceeds a certain level, driving gasoline automobiles is restricted. Eco-friendly alternatives are available such as electric bicycles and powered kick scooters for sharing. Route buses are electric as well and even electric cars are available for driving and dropping off. The city is also being transformed and revamped for pedestrian use as well.