Learning to rollerskate was a pain: literally. Making a tailbone landing on concrete always limited my childhood enjoyment of the activity.
Today’s invention is therefore skates (or skateboards) with brakes.
Inside each wheel would be a small drum brake powered by a spring which would be wound up by a learner skater’s normal forward movement. The brakes would be fitted with a wireless receiver.
The user’s mobile phone would then allow these brakes to be actuated by releasing the springs progressively, in response to a particular key press.
This would allow discreet control of the deceleration, hiding one’s Learner status (and also potentially giving even expert skaters an extra ‘handbrake turn’ facility).