The shock absorbance numbers are impressive, says Randy Swart, director of the Bicycle Helmet Safety Institute in Arlington, Va.

FORBES: Meet The Girls Who Want To Sell You An Invisible Helmet

But Sustrans and The Bicycle Helmet Research Foundation (BHRF) are among those opposed.

BBC: Annette Brooke MP wants review of cycle helmet law

Randy Swart, director of the Bicycle Helmet Safety Institute in Arlington, Va.

FORBES: The $500 Air Bag For Your Head

We realised that our industrial design master thesis was the perfect place to find out whether the traditional bicycle helmet could be improved on.

FORBES: An Airbag For Your Head - The Invisible Bike Helmet

Producing a bicycle helmet that people would be happy to put on looked like a much better way to go than legislation forcing people to wear one or else.

FORBES: An Airbag For Your Head - The Invisible Bike Helmet

Mr Brown, who was wearing a helmet, was riding with a group of cyclists when he fell off his bicycle.

BBC: Pothole