Water bottle amplifier

Try it and see how scary it is when a car comes from your blind spot straight past you at 40mph. It's not really that safe in London at least because you need all your senses operating at full to even stand a chance and even then you can get caught off guard.

try being profoundly deaf and see how scary it is when a car comes from your blind spot straight past you at 40mph.

as long you're quite aware of your surrounding, by all mean, wear as much headphone as you like!