Abstract
Japan has already become aged society, rate of aged person 65+ is now exceed 20%. Problem on traffic accidents concerning older drivers is increasing. Especially, in case of person 75+, dementia characteristics may have great effect on driving. Although medical check system for dementia is established, check method for driving has not yet existed. The authors examined relationship between driving performance and cognitive performance using drunken condition. Indicators for judgment driving competence is newly proposed.
