As the full dualling to Inverness is now policy I'd like to see the proposed WS2+1 Alvie upgrade which is almost 4km IIRC made dual carriageway, that would be a decent length of DC on what is currently the longest single carriageway stretch between Inverness and Perth. Hopefully each new bit of DC will by increasing overtaking opportunities, reduce frustration and the risk of accidents that can bring.
Doesn't help the families who've lost loved ones in what's been a terrible week on the roads.