The Islamabad administration recently approved an expensive expansion of Islamabad highway. Adding more lanes under passes and over passes.
This will not solve the problem. Lanes from airport exit up to gt road are badly needed sure. But there are bottle necks where 3-5 lanes become less for a short period of time. That is a major issue. There are people crossing the road everywhere.
To solve the problem they need to find out where most of the traffic is coming and going from. Make it flow smoother. Make alternate routes. They can make it one hundred lanes wide but if they don't manage it properly nothing will be solved.
Then again why do they care to solve people's problems that would leave less work to spend money on.