Is undertaking a lane hogger on the motorway illegal?

Previously, when people ask for your advice regarding passing dawdler on the nearside, you have said that it is not illegal to undertake. Furthermore, one of your correspondents has said that the safer...

How do I know when do the restrictions on smart motorways end?

I regularly drive on a 20 mile stretch of smart motorway, often late at night. When do "restrictions" end? For example, if two left lanes show red X and right two lanes show 40 limit ( X X 40 40) and...

What should we do if we break down in the live lane of a Smart motorway?

What should we do if we break down in the live lane of a Smart motorway? Should we ring 999, for example?