Tripoli will soon be isolated from reinforcement by land if progress by the TNC continues:
There’s fighting at A and C on this map, within 100 miles of Tripoli.
Rebels have captured Bir Ghanam only 50 miles from Tripoli. No doubt Ghaddafi’s forces could become stronger as they become concentrated around Tripoli but they will also be short of options and material. Every gain by the rebels costs Ghaddafi men and materiel.