terrafugia has completed extensive analysis and crash simulation on the car in order to become mass-production ready and ensure industry partners of ‘transition’s ability to meet all road safety standards. the USA’s national highway traffic safety administration (NHTSA) exemptions of the roadable aircraft’s excess weight was due to the company’s preference in safer flight/drive materials. the vehicle is formed from polycarbonate materials, rather than automotive safety glass, in order to prevent the shattering of the windshield in an instance of the car’s pilot hitting a bird in flight. additionally, the tires of the air-road vehicle are heavier than automotive tires in order to accommodate both the stress of landings on the vehicle’s body as well as standard road driving.