title: [The review of traffic safety researches].
abstract: The traffic system has a multi-layered hierarchical structure. Traffic accidents are a phenomena on the man-machine system located at the middle level of the hierarchy. Focusing on this holon (man-machine system), safety problems are reviewed in relation with the upper and lower systems interacting with this holon.
mesh_terms: D000056:Accident Prevention; D000063:Accidents, Traffic / Q000517:prevention & control*; D001334:Automobile Driving; D006801:Humans; D008328:Man-Machine Systems; D009042:Motivation; D012449:Safety; D014796:Visual Perception