You’re on a motorway. What does it mean when a mandatory speed limit is displayed above the hard shoulder?

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You're on a motorway. What does it mean when a mandatory speed limit is displayed above the hard shoulder?

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A mandatory speed-limit sign above the hard shoulder shows that this part of the road can be used as a running lane between junctions. You must stay within the speed limit. Look out for vehicles that may have broken down and could be blocking the hard shoulder.