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...

Should I fight a variable speeding ticket?

I regularly use the M1 between, junction 10 and 13, where the variable speed limit signs are permanently on even if the road is completely clear. In fact, people have got so used to this that they ignore...