SAFE bicycle with Helmet / Transportation

The number of people don't wear bike helmets is nearly 6 times more than people wear helmets when suffering a Serious head injury in traffic accident. Plus, medical fee of people without helmets is 3 times more than people was protected by helmet.
When you want to rent a bicycle,the lock of bicycle and helmet will open together,this design urges you to wear helmet.And when you return the bicycle,you must return the bicycle and helmet at the same time.
The purpose of this system is to urge people to wear helmet in the cycling.Riders are urged to carry a helmet owing to the rule. Therefore,they have to wear the helmet on the trip.