The first pictures of the Smart forfour - the city car maker’s first four-seat model, show some family links to the tiny city-coupe models with exposed metal safety cell and removeable plastic panels. The new car is 3,670mm long, 150mm more than a standard-wheelbase Mercedes A-class and will come with three petrol (1.1-1.4-litre) and two diesels, including a 1.5-litre turbodiesel.