How fast can you drive with a surfboard on the roof?

When driving with a surfboard on the roof, it's important to follow local traffic laws and regulations, which typically set speed limits for all vehicles. Generally, you should drive at a safe speed that ensures the surfboard remains secure, usually not exceeding the posted speed limit. Additionally, it's advisable to consider wind resistance and stability, which may require driving a bit slower, especially on highways. Always ensure the surfboard is properly secured to avoid any accidents.