This is a good balanced page on the limits of helmet protection from a pro helmet site (USA):
https://www.helmets.org/limits.htm
If you fall at low speed you want a cushioning full face helmet (doesn't exist). If you crash at high speed your head is the least of your worries. If you are hit by a car at speed in the best case scenario you are dead and in the worst you are in a wheelchair for the rest of your life.
I wear a helmet on my trike because:
- I am lying down and when it rolls over in an off camber corner my head is going to be underneath. Imagine an ageing bald guy with gravel rash on his skull
- it keeps insects out of my eyes at speed (never ride a trike with your mouth open!)
- it makes me look like I know what I'm doing
https://www.helmets.org/limits.htm
If you fall at low speed you want a cushioning full face helmet (doesn't exist). If you crash at high speed your head is the least of your worries. If you are hit by a car at speed in the best case scenario you are dead and in the worst you are in a wheelchair for the rest of your life.
I wear a helmet on my trike because:
- I am lying down and when it rolls over in an off camber corner my head is going to be underneath. Imagine an ageing bald guy with gravel rash on his skull
- it keeps insects out of my eyes at speed (never ride a trike with your mouth open!)
- it makes me look like I know what I'm doing