PANews reported on April 18th that, according to CCTV International News, a ban on heavy vehicles entering Islamabad has officially taken effect, long-distance bus station controls have been upgraded, and subway and bus services have been 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 next round of US-Iran negotiations.