The Setra TopClass S 531 DT double-decker sets many benchmarks in its category. Besides its fascinating looks, it impresses especially as a prime example of aerodynamics and fuel efficiency and offers the greatest levels of variability, comfort and safety. The impressive touring coach covers all types of operation required of touring and regular-service routes and, with the best values for aerodynamics, is on its way to achieving new consumption records in its segment. Its comprehensive safety equipment fitted as standard is also remarkable. Together with the Setra TopClass S 531 DT the assistance systems Active Brake Assist 4 and Sideguard Assist celebrated their world premiere in a bus.