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Guest Editorial: Special issue on Passenger car secondary safety

Transport safety can be facilitated by ensuring compatibility between the three major elements involved, i.e., traffic environment, vehicle, and operator. Improving each of the three elements in isolation would result in reduced accident frequencies and/or increased protection, but would not necessarily generate a safe traffic environment. In the absence a compatible safe traffic environment, increasing effort is applied to provision of primary and secondary protective features into vehicle design. Assuming that the operator is qualified and competent to drive and not rendered incapable in any way, and that the vehicle is certificated to be on the road, the main contribution to primary safety and accident prevention is through improvement in the following areas: