ST. CLOUD (AP) - The State Patrol says at least 31 motorcyclists have died on Minnesota roads so far this year, accounting for more than 18 percent of all traffic deaths.

Yet state officials say motorcycle safety classes available around the state aren't getting enough participants. Minnesota has more than 414,000 licensed riders, but only 300 to 400 motorcyclists participate each year in a safety class beyond the first Basic Rider Course offered by the Minnesota Motorcycle Safety Center. About 60 percent of motorcyclists take that course before earning their license.

State law doesn't require motorcycle training, but experts says many crashes are caused by rider error and inexperience.

Some riders also believe aggressive or inattentive vehicle drivers are to blame for motorcycle danger.