1. Risk, especially risk of traffic accident
2. 2. National Highway Traffic Safety Administration (USA) ,Fatal Accident Reporting System - 1983, DOT-HS-806-705, March (1984 ).
3. 3. A. D. Horowitz , "Automobile Usage: A Factbook on Trips and Weekly Travel ," Research Publication GMR-5351, General Motors Research Laboratories, Warren, Michigan 48090, April 2 (1986 ).
4. 5. National Research Council (USA) , "55: A Decade of Experience ," Transportation Research Board Special Report 204 (1984 ).