There are three main types of bike racks for transporting bicycles by vehicle: roof racks, trunk racks, and hitch racks. Roof racks allow full access to the vehicle's trunk but can cause wind resistance and noise. Trunk racks are very common and easy to use but prevent access to the trunk when installed. Hitch racks are the easiest to install but require a trailer hitch, and backing up with the extended length can be difficult. Each rack type has benefits and drawbacks to consider.