 The production model utilised the same Alcan bonded honeycomb aluminium structure vehicle technology ( ASVT ) as the concept car for the chassis . The chassis design featured two box section rails which acted as the suspension mounting points and would provide an energy absorbing structure in the event of a frontal impact , these were successfully tested at speeds up to 30 mph ( 48 km / h ) , an integral roll cage formed part of the chassis and monocoque , providing additional structural rigidity for the car and allowing the XJ220 to easily pass stringent crash testing . 
