LANSING, Mich. (AP) — A University of Michigan researcher estimates there would have been 26 fewer deaths and 49 fewer serious injuries in Michigan last year if all riders had worn helmets, as it was previously required under Michigan law.

Last year, Michigan joined 30 other states in allowing adult riders to go without a helmet, a move welcomed by supporters who said it would draw more motorcycle riders to Michigan and increase tourism revenue. But some say that early crash data shows that changing the law was a mistake.