Just a little story of a trip on the A1 recently. There were signs on roadworks 1 mile ahead indicating that the nearside lane was closed, some people immediately pulled into the right lane (dual carriageway at this point). 800 yard signs with the blocked lane and right lane showing as open, this starts the next round of people moving into the right lane.
At this time the right lane is congested and is much slower than the left as I was the only person in that lane, as usual I was the only one that wanted to merge in turn. In front of me someone in a tired Mondeo thought it good practice to change into the left lane maintaining the speed of the right, this caused me to have to make a choice, emergency stop or use the hard shoulder to drive passed, I chose the hard shoulder and carried on my merry way to the roadworks to merge in turn.
The 200 yard sign comes and goes, then nothing, there is still a right lane full of vehicles and a left empty besides me and no roadworks, no closure of the left lane just a queue of cars.