When is it permissible to ride without a helmet?

Riding without a helmet is permissible in states where helmet laws establish specific conditions, such as allowing certain age groups or licensed individuals the option to ride without one. Many states have implemented regulations that allow riders above a certain age—typically 18 or 21 years old—to opt out of wearing a helmet provided they meet specific licensing requirements. This law aligns with individual freedoms and the idea that mature riders can make their own safety decisions.

The other options do not accurately reflect the legal framework surrounding helmet use. For instance, assuming that riding without a helmet is allowed in all states disregards the variations in state laws where helmet use is mandated for all riders. Restricting the choice to only daytime riding or private property does not align with legal regulations that apply to public roadways, where different safety requirements must be adhered to.