1. According to the statistics done by National Police Agency:
1) A1 accidents (causing death at site or within 24 hours) between 2009 and 2013: Seniors more than 70 years old occupied the highest proportion among the age groups of the death.
2) A2 accidents (causing injury or death after 24 hours) in 2014: Drivers between 75 years old and 80 years old occupied the highest proportion.
2. The prevalence rate of dementia according to the statistics done by Taiwan Alzheimer's Disease Association:
1) 3.4% for age group between 65 and 69 years old, 3.46% for the age group between 70 and 74 years old, and 7.10% for the age group between 75 and 79 years old.
2) The prevalence rate of dementia at 75 years old is around 2 times of that at 65 years old.
3. Regulations of driving license management in the advanced countries and nearby countries: The ages defined in the driving license management for elderly drivers in Japan, South Korea, Singapore, Australia, U.S.A, and Canada vary among 65, 79, 75 and 80 years old. In Japan, drivers over 75 years old will have to participate in cognitive function testing.
4. Directorate General of Highways invited medical circles, traffic safety experts, and scholars to hold 4 sessions of national public hearings for discussion. With the research, analysis and suggestions done by Taiwanese Society of Psychiatry, the final conclusion for the objects are drivers at 75 years old or above.