Not sure the dutch ones are fixed wheel exactly, arent they just back pedal brakes? If you pedalled backwards on a fixed wheel you would be going backwards, not just braking.Lot of fixed wheel bikes in the Netherlands when I lived there, normal bike but no brakes and you put pressure backwards on the pedals to brake. Took getting used to because I'd got in the habit of freewheeling the pedals backwards when I had an idle moment.

