At this time, the completion was estimated to occur in 2004, at a cost of $151 million (about $ in US-GDP dollars).US-GDP In October 2000, Carmel Valley Road was extended to Black Mountain Road, providing a paved alternative until SR 56 was completed; commuters had to travel on a 2 miles unpaved road, one of the only roads between I-5 and I-15 in North County.