Final answer:
Traffic moving at less than the normal speed on a freeway should use the right-hand lane, also known as the slow lane, to maintain traffic flow.
Step-by-step explanation:
On a freeway, traffic moving at less than the normal speed should always use the right-hand lane or the slow lane. This is standard protocol in many regions, which helps maintain a smoother flow of traffic and allows vehicles moving at higher speeds to pass on the left safely.
Following these rules is crucial for safety and efficiency on the freeway. In areas with multiple lanes, faster traffic should move to the left, while slower traffic stays to the right, unless overtaking or according to road signs indicating otherwise. This measure reduces instances of vehicles speeding and the need for potential traffic signals to control speeds.