Explanation:
The correct answer is C: Subways.
Here is a detailed explanation:
Definition:
- Roads built underground are commonly referred to as "subways."
- They are designed to provide an underground transportation system for vehicles or pedestrians.
Characteristics of Subways:
- Subways are typically found in urban areas where space is limited and there is a need for efficient transportation.
- They are usually constructed using tunnels or underground passages.
- Subways often have dedicated lanes or tracks for trains, trams, or other forms of public transportation.
- They may also include walkways or pedestrian tunnels for people to navigate through the underground network.
Examples of Subways:
- The London Underground, also known as the Tube, is one of the most famous subway systems in the world.
- Other notable examples include the New York City Subway, Paris Metro, Tokyo Metro, and Moscow Metro.
Advantages of Subways:
- Subways offer a convenient and efficient mode of transportation, especially in heavily congested urban areas.
- They can help reduce traffic congestion and pollution by providing an alternative to driving.
- Subways are often faster than surface-level roads due to fewer traffic delays and dedicated tracks.
- They can accommodate a large number of passengers, making them ideal for densely populated cities.
Conclusion:
Roads built underground are commonly referred to as subways. They provide an efficient and convenient transportation system for vehicles and pedestrians in urban areas. Examples of subways include the London Underground, New York City Subway, and Paris Metro. Subways offer advantages such as reduced traffic congestion, faster travel times, and the ability to accommodate a large number of passengers.