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Smart FourJoy concept

The Smart FourJoy concept will preview next year's all-new four-seat model at the Frankfurt motor show. Unlike the ForFour (2004-06) that paid only lip service to the brand's iconic city car, this promises to be a true Smart, with the familiar Tridon safety shell, minimal overhangs and plastic panels. At 3,494mm long it's around a meter longer than the original two-seat version but still significantly shorter than a Mini.

Concept Car of the Week: Honda HP-X (1984)

20 years after producing its first production car, Honda grew enough confidence to challenge European sports cars on their own turf. Going straight for the jugular, they commissioned the famous Italian carrozeria Pininfarina to design a mid-engined two-seater concept for the 1984 Turin Motor show. The HP-X, standing for Honda Pininfarina eXperimental, had a very clean composition divided in three distinct elements: the matte black lower, the white ribbed body and the completely transparent canopy on top.

Mercedes-Benz CLA180 cheats the wind

Mercedes-Benz claims its new CLA180 BlueEfficiency Edition will be the world's most aerodynamically efficient production road car when the European deliveries begin in June. The swoopy four-door sedan forms part of an initial five-car lineup of CLA models set for a public debut at the Geneva motor show in March. With an official drag co-efficient of 0.22, the CLA180 Blue Efficiency Edition undercuts the existing aerodynamic champion, the Mercedes B180 BlueEfficiency with the optional eco technology package, which claims a 0.24 Cd.