I'm undecided, David.
I spend most of my time on tarmac with the helmet strapped onto some part of the bike, rucksack or rack, rather than onto my head, and I don't know if I would notice the difference anyway as I appear to be a lot more immune to close passes than others. However, I must admit a certain fascination with reading reports from someone who is willing to test the average distances with a helmet compared to a blonde wig.
I spend most of my time on tarmac with the helmet strapped onto some part of the bike, rucksack or rack, rather than onto my head, and I don't know if I would notice the difference anyway as I appear to be a lot more immune to close passes than others. However, I must admit a certain fascination with reading reports from someone who is willing to test the average distances with a helmet compared to a blonde wig.