1. 19 The wearing of a crash helmet is required by law.

2. 17 A man in a crash helmet was mounting a motorbike.

3. She said that the crash-helmet would flatten her hair-do.

4. 20 He pulled on a battered old crash helmet with a scratched visor.

5. 25 The plaintiff was guilty of contributory negligence for failing to wear a crash helmet.

6. 5 The plaintiff was guilty of contributory negligence for failing to wear a crash helmet.