A major car collision in Pacifica caused closure of both Northbound and Southbound CA-1, per California Highway Patrol.
All lanes are blocked between Crespi Drive and Fassler Avenue, and emergency officials said they will remain closed until about 12:30 a.m. or 1:30 a.m. on Sunday.
CHP officials are asking the public to avoid the area.
Bay City News contributed to this story.