With all the rain we have had over the last few days in Calis I've noticed that more motor cyclists are wearing crash helmets. Is this because:
a) The wet and slippery roads from the rain could cause an accident, and so a helmet, whilst not normally worn, is now a must.
or
b) The helmet keeps your hair dry, and so when the rain stops the fashion conscious motor cyclists can return to the more normal hair to the air style.

I think we should be told.