The remaining expressway portion of SR 54 was replaced by a freeway in two phases in the late 1990s and the 2000s. The first phase corresponded with construction of SR 125 north of Jamacha Boulevard to SR 94; construction began in 1996 and was completed in 2003. The second phase consisted of the construction of the SR 125 toll road and opened on November 19, 2007. While California Transportation Ventures owned the franchise on the tolled portion of SR 125, the interchange with SR 54 was constructed with $160 million (about $ in dollars) of public finances. From 2005 to 2007, of rock were blasted through in 160 separate explosions to allow for the interchange to be built. The project to convert the HOV lanes to regular mixed traffic lanes was authorized in 2006. Caltrans determined that the lack of space for law enforcement to pull over carpool lane violators, as well as a missing barrier that separated the HOV lanes from regular traffic, made the lanes less effective.