Imagine that you have a group of friends and all of you want to go for a bike ride in the steep ridges far away from your home. You have only one car to get to the place. All the accessories, luggage and other apparatus are to be accommodated in the car; and more importantly the bikes.
Earlier when would go for biking, you would remove the tyre of your bike and keep it in the boot. But, this time you cannot do so as the trunk of the car is already occupied with other accessories. Besides, you have more than one bike and all of them cannot be accommodated in the boot. Under such circumstances, you can fix roof racks to your car and get over with the problem of carrying the bikes.
Not only for the purpose of carrying bikes, roof rack come handy in so many other ways. When you are to go for fishing, you need to take the fishing road and other accessories with you. Being rather long, they cannot be kept in the trunk. So, you can attach them with the racks. In this way, you can carry wheel chairs, kayaks, surfing boats, etc. with you, if you have racks on the car. These racks are available in various shapes. You can choose as per your need and choice.
Another car accessory that can be used to solve the space problem in a car is roof boxes. They are meant for small kits and accessories. If the boot of your car is already occupied by the pet or some big luggage, the box can provide you with space. You can put some kits and accessories in them. Both roof rack [http://www.directcaraccessories.co.uk/catalog/roof-barsboxes-c-3310.html] and roof boxes will increase the attraction of your car, if you choose them judiciously. You can even fix both these accessories together, side by side on the top of his car.