Final answer:
The three helmet standards worldwide for safety are DOT, ECE, and SNELL. They can be arranged in the order of increasing safety as DOT, ECE, and SNELL.
Step-by-step explanation:
There are three helmet standards worldwide for safety. These standards are:
- DOT (Department of Transportation) - This standard is used in the United States and is meant for motorcycle helmets. DOT-certified helmets must meet certain impact attenuation and penetration requirements.
- ECE (Economic Commission for Europe) - This standard is used in Europe and is recognized in over 50 countries. ECE-certified helmets go through extensive testing for impact resistance, retention system effectiveness, and peripheral vision.
- SNELL (Snell Memorial Foundation) - This standard is used primarily in North America. SNELL-certified helmets undergo rigorous testing for impact resistance, strength, and stability.
In terms of increasing safety, these standards can be arranged in the following order: DOT, ECE, and SNELL.