What should you do if you see this sign on a motorway while driving in the right-hand lane?

Explanation: This sign on the overhead gantry will be accompanied by flashing amber lights. The arrow directs you to move into the next lane. There might not be any visible signs of a problem ahead, but there might be queuing traffic or another hazard that you can't yet see.

Category: Band 2 traffic signs and signals (2021)

References: Highway Code: Page 102, Know Your Traffic Signs: Page 90