Catesby Tunnel is set to become the worldwide benchmark for aerodynamic testing and vehicle development. The facility will allow accurate assessment of aerodynamic performance, cooling, aeroacoustics, emissions, dirt deposition and more. Its unique underground and fully-sealed working section ensures there is zero wind, rain or background noise in additional to minimal temperature changes. This will provide the perfect environment for accurate, reliable and ultra-repeatable testing. The tunnel houses a 2.7km extremely smooth and flat road surface and boasts an enormous 40 square metre working section, complete with turntables at either end. Due to its underground nature and secluded location in the UK, the facility provides the perfect environment to test in complete privacy.