Double-decker buses are large vehicles designed to carry passengers on two levels. They are commonly found in cities like London, where they are an iconic part of public transportation. The upper deck offers a unique view of the surroundings, making the ride enjoyable for tourists and locals alike. These buses typically have a staircase leading to the upper level and can accommodate a significant number of passengers. They are often painted in bright colors and feature large windows. Double-decker buses are not only practical for transporting people but also help reduce traffic congestion in busy urban areas.