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Infrastructure systems such as vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2X) communication can theoretically prevent nearly all accidents by gathering the speed, locations, and travel directions of traffic participants, and intervening to control vehicle motion as required to help prevent collisions. However, during the phase-in of the communication systems, there will be many vehicles and many roads that do not have the communication systems in place, and therefore the system will not be effective in those cases. This lack of availability is likely the main disadvantage. On-board sensing (autonomous) systems such as cameras and radar sensors may not detect all potential hazards (e.g. due to weather, or hidden hazards), but they are effective in many situations and can help prevent crashes without depending on communication with infrastructure or other vehicles.

The safety situation in Sweden has improved the last decade but the positive trend has levelled out the last few years. The parliament has taken interest in the problem and has formulated the “Vision Zero” as a new strategy. The Vision Zero claims that it is not acceptable to have fatalities and injuries leading to long-term problem in the road transport system. The government has further focussed the work by a special 11-point program for traffic safety and an investigation how to establish legislation giving all system designers larger responsibility for the safety level in the road transport system. New better knowledge is needed to support the new strategy. Changing the focus from accidents to preventing severe injuries will help to solve the problem. More co-operations between the various traffic safety disciplines are urged for in the design of a crashworthy road transport system, where vehicles, infrastructure, speed and human failures are handled simultaneously.