S-segment  S-segment is a European car-classification segment for "sport coupés". The cars are often described as sports cars and the equivalent Euro NCAP class is called "roadster sport". S-segment cars have a sporting appearance and are usually designed to have superior handling and/or straight-line acceleration compared to other segments. The most common body styles for S-segment cars are coupé and convertible. Rear passenger accommodation is not a priority for S-segment cars, therefore many models are either two-seat cars or have a 2+2 layout with relatively cramped rear seating. Most recent S-segment cars use the commonplace front-engine design (as either an FF layout, FR layout or F4 layout), however the majority of cars with a Mid-engine design or rear-engine design belong to the S-segment. The five highest selling S-segment cars in Europe are the Audi TT, Mazda MX-5, Porsche 911, Ford Mustang and Porsche Boxster/Cayman. In 2014, the five highest selling coupé models were the BMW 4 Series, Opel Astra GTC, BMW 2 Series, Renault Mégane Coupé and Mercedes-Benz C-Class (W204). The five highest selling convertible models in 2014 were the Fiat 500C, Mini Hatch, BMW 4 Series (F32), Volkswagen Beetle (A5),  Rolls-Royce Wraith, Rolls-Royce Dawn and Volkswagen Golf Mk6.