Although drivers’ education, income and social status are expected to be potential factors that are associated with traffic violations and accident severity, this information is generally not recorded in the traffic accident database. Instead, related information indicated by the drivers’ hukou origin and occupation are available. Two groups of the hukou household registration system are examined: rural hukou and urban hukou. Occupations are classified as: military and police, general staff members, workers, civil servants, the self-employed, farmers, migrant workers, the unemployed and other occupations.