 In 2006, construction began to extend Autoroute 30 north of the St. Lawrence River (over a new crossing) to the existing junction with Autoroute 540 and Autoroute 20, necessitating reconstruction of that interchange.Once that was completed in December 2012, A-540 was annexed and re-designated as an extension of Autoroute 30, while the old alignment of A-30 south of Salaberry-de-Valleyfield was renamed Autoroute 530.This made the expanded A-30 a ring road serving the southwestern part of the Montreal metropolitan area.