The course was evaluated in 2011 on the basis of a sample of 2 100 drivers from 70 years on who had reported an accident to their insurance company during a two-year period. About 24% of the sample had completed the course prior to the accident. Drivers who had taken the refresher course before turning 75 years old were found to be at a 35% lower risk of being involved in multiple vehicle crashes compared to older drivers who had not taken the course (Ulleberg et al.