1. Road traffic safety refers to methods and measures for reducing the risk of a person using the road network for being killed or seriously injured. Best-practice road safety strategies focus upon the prevention of serious injury and death crashes in spite of human fallibility.

2. Generally, the context in which an individual lives is of great importance for both his health status and quality of their life. It is increasingly recognized that health is maintained and improved not only through the advancement and application of health science, but also through the efforts and intelligent lifestyle choices of the individual and society.

3. Safety is the state of being "safe", the condition of being protected against physical, social, spiritual, financial, political, emotional, occupational, psychological, educational, or other types or consequences of failure, damage, error, accidents, harm, or any other event that could be considered non-desirable.