Subways are popular because they are better for the environment than cars. They cut down a lot of carbon emissions, which is important in cities. They also help with traffic problems. Streets are often full of cars, but subways don't make this worse because they go underground. This helps people travel quicker and with less stress.

Subways are really liked because they are more reliable than road transport. They follow a fixed schedule and are not much affected by the traffic above. When you take a subway, you're likely to get to your destination on time. This dependability is great for people who commute and are fed up with unexpected traffic and delays.