Early this morning (April 18), a ban on heavy vehicles entering Islamabad officially took effect. Control measures at local long-distance bus stations were tightened, and subway and bus services were shortened. The core logic behind Islamabad's transportation upgrades lies in enhancing the atmosphere of mutual trust, using absolute physical security to compensate for weak foundations in external trust, and proving to Washington and Tehran that the Islamabad negotiating table is not only a geographical transit point, but also an absolute safe haven in terms of information and security. Currently, the Pakistani government has not yet announced a timetable for the new round of US-Iran negotiations. (CCTV International News)