| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | bicycle helmet | Cycling-centric countries | Commonly worn by cyclists for safety, especially in urban areas | 1 |
| 2 | bicycle helmets | Cycling culture in Europe | Optional to wear bicycle helmets for adults | 1 |
| 3 | helmet | Bicycle cultures | Wearing a helmet while cycling is not as common and is not required by law in some places | 1 |
| 4 | helmet | Cycling-centric countries | It is uncommon for adults to wear helmets while cycling as cycling infrastructure and rules prioritize safety without helmets. | 1 |