A "SportRack" rack on the roof of your vehicle is the best way to transport your kayak. You must securely attach it to each bar, and also attach its front and rear to the vehicle ends. We recommend using kayak cradles when the kayak is transported flat.
While not as safe as a roof rack, you can also use foam blocks if you travel only for a short distance, or make a longer journey at low speed. The blocks must be wide enough to provide sufficient support. The kayak must be securely attached to the vehicle.