Why was the subway an advantage over other means of transportation?

The subway offers several advantages over other forms of transportation, primarily due to its efficiency and capacity. It can transport large numbers of passengers quickly, bypassing surface traffic congestion and reducing travel times. Additionally, subways often have lower operational costs per passenger compared to buses and cars, and they contribute to reduced air pollution and traffic congestion in urban areas. Overall, subways provide a reliable and sustainable solution for urban transit challenges.