SF agencies opened a newly re-aligned freeway ramp yesterday that lands on Fremont at Folsom Street. The ramp fix came in at a cost of $5,274,000, nearly twice the original estimate of $2,883,900.
The design of the original Highway 80 off-ramp, installed after the removal of the Embarcadero Freeway to whisk drivers from the Bay Bridge into east SoMa, was widely considered a mistake.
The purpose of the realignment project, as stated by the SF County Transportation Authority, was to change “the off-ramp configuration to function better as a gateway into a pedestrian-oriented neighborhood,” as well as to reduce the footprint of the ramp to make room for a building development.
The old ramp configuration, which shot car traffic diagonally into the intersection of Fremont and Folsom, represented the type of 20th-century freeway engineering that has made for deadly intersections along Highway 80 through SoMa. The ramp forked as it touched down, consuming additional land and encouraging drivers to merge onto Fremont without stopping.
The new ramp doesn’t split in two, instead landing mid-block at a perpendicular angle to Fremont, where there’s now a traffic signal.
The ramp fix was originally supposed to wrap up in January, but crews discovered that the soil was more heavily contaminated than expected with lead and motor oil [PDF], much of it likely from the heavy motor traffic passing by. That drove up the costs, along with “unexpected” changes in Caltrans engineering standards, planners said.