Propaganda. It was initiated by last government and the road work started while Musharaf was still in power. It was not proposed in 1997-98 (how nicely you are trying to attribute it to your favourite 
). This is all in the original plan on Islamabad.
Here is more information if anyone is interested:
Islamabad: 7th Avenue - .::UrbanPK::.
http://www.urbanpk.com/forums/index.php?showtopic=8014&pid=24423&mode=threaded&start=#entry24423
http://www.urbanpk.com/forums/index.php?showtopic=8014&pid=24728&mode=threaded&start=#entry24728