UGO Safety Brake for strollers by River X. Suh

Whenever I think about baby prams, I envision that scene in The Untouchables with the pram rolling down the staircase in the middle of a shootout. My college roommate recently had a baby boy, and with a middle name like 'Danger', I fear for his pram days. James William Wansey, a student at the University of New South Wales, made the James Dyson Award shortlist for his UGO Safety Brake. His description says:

The UGO safety brake is an automatic brake system for strollers and prams that ensures that the stroller cannot roll away accidentally and cause injury to a child. The design relies on a wireless communication between the wheel hub of the stroller and the hand-held unit which is worn by the parent. When the stroller and the parent separate by more than two meters, the wireless connection is lost and the brakes pulse to bring the stroller to a stop. The brake system is powered by the rotation of the wheel and is fully contained within the hub of the wheel.

Wansey claims that 10% of children treated for stroller-related injuries in ER in Australia are from roll-away situations. My only response is, why wasn't this invented sooner?

UGO Safety Brake (via Yanko Design)