KYOTO--An iron helmet believed worn by a Mongol warrior during a 13th-century invasion of Japan has turned up at a shrine here, which prayed for the nation’s victory. The cone-shaped headgear ...

On April 1, Japan introduced an ordinance encouraging all bicycle riders, regardless of age, to wear helmets. The measure goes into effect amid a growing number of accidents across the country.

The National Police Agency said on Sept. 12 that the rate of helmet usage among cyclists in Japan rose to 17 percent this year, up 3.5 percentage points from last year. Cyclists have been required ...