Standard and requirements for motorcycle helmets

There are various standards and requirements for motorcycle helmets around the world, and they typically vary by country or region. Here are some examples of standards and requirements:

1. DOT (Department of Transportation): The DOT standard is the most common standard in the United States. Helmets that meet DOT requirements have a sticker on the back indicating compliance with FMVSS 218, which is the Federal Motor Vehicle Safety Standard No. 218.

2. ECE (Economic Commission for Europe): The ECE 22.05 standard is required in European countries and other parts of the world. This standard requires that helmets pass impact, penetration, retention system strength, and field of vision tests.

3. Snell Memorial Foundation: The Snell Memorial Foundation is a non-profit organization that sets voluntary standards for motorcycle helmets. The Snell M2015 standard is a common one in the United States.

4. Australian Standards: Helmets sold in Australia must meet the AS/NZS 1698 standard, which includes impact, penetration, retention system strength, and field of vision tests.

5. Japanese Industrial Standards (JIS): Helmets sold in Japan must meet the JIS T 8133 standard, which includes impact, penetration, retention system strength, and field of vision tests.

In general, motorcycle helmets should fit snugly, have a chin strap that can be securely fastened, and provide adequate protection for the head and face. It's also important to check the manufacturer's recommended usage and maintenance guidelines, as well as to replace helmets after any significant impact or after a certain number of years (typically around five).