I only ask as ds1 took his bike to the park today. As it's mostly grass and flat paths I didn't bother taking his helmet. Neither did any of the other parents whose children had bikes in there. In fact, I've not seen a child with a helmet all summer.
But ds1 decided to be adventurous today. He hurtled down the only hill in the park and forgot to use his brakes at the bottom. I managed to get in front of him to stop the bike, but he flew off anyway and went head first into the bandstand.
Result - an inch long gash in the side of his head that A&E had to glue back together.
The nurse in A&E made me feel like the most useless mother in the world when I said that he wasn't wearing his helmet. I felt like I was the one who was four years old, not ds1. The nurse said that he sees head and brain injuries all the time from children who've come off their bikes in supposedly safe areas, and that ds could easily have been killed.
So, am I the only mother who's crap enough to let her children ride bikes in park and garden without hats?