The metro, or subway, is a public transport service that is wholly or partly underground and capable of transporting large numbers of passengers quickly between urban destinations. The Kyiv subway system, for example, transports over 1.3 million people per day on average.
The metro has a number of advantages:
- Trains travel at high speeds, reaching up to 80 kilometres per hour.
- It has a huge capacity, carrying up to 60,000 passengers per hour in one direction.
- It saves space in urban locations.
- It works on electric traction and does not, therefore, contribute to air pollution.
- The tracks are completely separate from other vehicle and pedestrian traffic.
- Trains run regularly, according to schedule, usually with a minimum daytime frequency of 3 minutes.