Your pupil asks what the blue patch means on this sign. What's the best reply? Your pupil asks what the blue patch means on this sign. What's the best reply?

• Possible answers:

   
• A. Motorway regulations apply on the road immediately ahead
• B. The road ahead is being upgraded to a motorway
• C. It shows an alternative route for non-motorway traffic
• D. The road ahead leads to a junction with a motorway