You are driving a car on a motorway with a national speed limit of 70 mph. Overhead electronic signs now show '40' inside a red circle because of an incident ahead. What should you do?

Explanation

Highway Code Rule 261 states you must not exceed 70 mph or any lower speed limit in force. Mandatory motorway signals that show a speed within a red ring are variable speed limits and become the new maximum speed. When you see '40' in a red circle, you must slow to 40 mph or less and be alert for hazards such as incidents or congestion ahead.