A bicycle carrier, also commonly called a bike rack is a device attached to an automobile or bus for transporting bicycles. Bus-mounted bike carriers are usually attached to the front of the bus. They may flip up against the bus, out of the way, when not carrying any bikes. Bikes may be mounted in the carriers by clamping both wheels and providing some additional vertical support, by clamping the rear wheel and the front dropouts.
In U.S., only people who older than 17 years old could drive a car. So Bick is still one of the key transaction tool for teenagers. When child going to some long distance, they need to bring their bick to this distance, and this is the mean reason and key market of auto bicycle rack. With the growth of number of new both. Auto Bicycle rack will be growing slowly with the population.