human
What is the difference between a'single' and 'double' decker bus?
assistant
The main difference between a single-decker bus and a double-decker bus is that a single-decker has only one level, while a double-decker has two levels. A single-decker typically seats about 40 passengers, while a double-decker can seat up to 60 passengers. Additionally, double-decker buses are usually more spacious than single-decker buses, as they have more room for standing passengers.