What should you do?
Read the message quickly without slowing sharply, and follow any instructions it gives about speed or lanes.
How to recognise it
A large black overhead electronic panel with amber text, here giving travel times to junctions and the tunnel.
Common confusion
The messages change; a speed limit shown in a red ring on such a sign is mandatory, while text messages are advisory information.
Explanation written by the My Driving Test editorial team using the Department of Transport Traffic Signs Manual conventions and the RSA Rules of the Road.
