Nebraska’s law requiring motorcyclists to wear helmets faces another challenge.

New state Sen. Charlie Janssen of Fremont introduced a bill (LB200) Monday to let people 21 and older ride motorcycles without wearing helmets.

Those 16 to 21 years old could ride helmet-free if they took safety courses. All riders would have to wear eye protection.

Nebraska’s helmet law was repealed more than 30 years ago but reinstated in 1989 after Congress tied highway funding to helmet laws.

A similar bill failed last year. Janssen is one of 16 new senators this year.

Twenty states and the District of Columbia require all motorcycle riders to wear protective helmets, according to the Insurance Institute for Highway Safety.