The Van Ness expansion part is only supposed to take a year, the rest of the previous 4~5 years was for a sewer replacement. It was done this way because of San

The Van Ness expansion part is only supposed to take a year, the rest of the previous 4~5 years was for a sewer replacement. It was done this way because of San Francisco's new policy requiring transit improvements to be coupled with large infrastructure maintenance (to minimize digging up the street multiple times) though in hindsight might not have been the best idea as it lengthens the amount of time the street is under construction.