
Properly securing cargo to the roof racks prevents injuries to you, the passengers, and others on the road. Consult the vehicle's manual if you're unsure about how to use the roof racks and related accessories.
The research will point out with certainty what's appropriate in most situations. For example, using a roof basket in conjunction with the top racks is best when transporting everyday items. In this case, opting for rope or bungie isn't a bad idea. A bike carrier is an attachment making bike hauling possible by way of the ordinary vehicle via the roof racks.
It's the same concept with kayaks and other small water rafts. To avoid damage to the vehicle, follow the manufacturer's instructions in regards to proper use of tie-downs, transit speed and cargo security in conjunction with roof racks.