Vehicle, Mobility and Transportation Design Valtra T4-Series Multifunctional Tractor by Kimmo Wihinen Good design in working machines is about quality, reliability, comfort and positive experiences. The highly functional cab where the user spends long hours maintaining his performance was done by the expertise of designers, engineers and end-users. The design language of T4 remains coherent from the large parts to the smallest ones, from interior to exterior. That is how the credibility and overall quality in the product is emphasized. Dynamic appearance underlines the notion of the machine that is always ready for the most demanding tasks.