Speed limits almost always have repeater signs at regular intervals, particularly when it&#x27;s not national speed limit. The recommended max speed signs on bends are different from speed limit signs too. If there&#x27;s not a red circle, it&#x27;s not mandatory. The exception is national speed limit signs, which would require the car to see if it&#x27;s a dual carriageway or not so it can switch between 60 and 70.