Karaj B1 bridge

B1 Bridge (Bilqan) (Persian: پل B1 (بیلقان)) is a cable-stayed bridge in Karaj, Alborz province, Iran. It is part of the Northern Karaj Freeway (Karaj Northern Bypass) project and spans the Karaj River near the entrance to Chalous Road. Bilqan is located about 4 kilometres from the city of Karaj, near the Azimiyeh district and at the beginning of Chalous Road. The B1 Bridge is one of several major structures along the Northern Karaj Freeway, which is intended to reduce congestion in the Karaj–Tehran corridor and improve connectivity between central, western, and northern regions of Iran. The bridge sustained significant damage in an attack by the United States in the 2026 Iran war. The attack killed eight people and wounded 95 others, and caused the bridge to partially collapse.