The question comes from the official IELTS sample (PDF): https://www.ielts.org/-/media/ea45c7fc36b14b699434210871c6f06b.ashx
Wear a helmet
Every year we are delighted to see more riders wearing protective helmets, but we would like to see every cyclist on the ride wearing one. More than half of reported injuries in cycling accidents are to the head, and a helmet gives the best protection when the head hits the ground.
The question:
Helmets are compulsory for all participants (T/F/NG)
The "right" answer is False, but this can be very opinion-based. If I was given this form in real live, I would say it is compulsory, based on my perception of social norms. The heading of the paragraph goes "Wear a helmet", which can be taken literally.
Besides, if we take a look at the previous paragraph it goes Follow all instructions. Following the same logic we can assume that following all instructions is not compulsory, in the same manner as not wearing the helmet.
but we would like to see every cyclist on the ride wearing one.which means not everyone wears a helmet. Ergo helmets in races are not mandated, they are an optional. – Mari-Lou A Oct 03 '20 at 12:41