Smart Forfour W453 The second-generation Forfour was jointly developed with Renault, reportedly sharing approximately 70% of its parts with the third-generation Renault Twingo, while retaining the trademark hemispherical steel safety cell, marketed as the Tridion cell. The Fortwo is assembled at Smartville, and the Forfour is manufactured alongside the Renault Twingo 3 in Novo Mesto, Slovenia. ...