In some situations (putting the bike on the car), it’s useful if the front wheel and handlebar do not move.
Build a locking mechanism into the front wheel and handlebar. It will help when you need to pick up and move the whole bike and also deter thieves.
People riding bikes can make extra money, and advertisers can have a new medium.
Mount a string of LED lights on both sides of a bicycle wheel’s spoke, connected to a controller and power source (battery or dynamo.). The controller will light up the individual LED lights based on the speed of the wheel to create the illusion of a message that can be read by people looking at the moving bike from both it sides.