Ocean Boulevard from Shoreline Drive to State Route 47 reopened just after midnight Sunday.
The closure was scheduled to last until 5 a.m. Monday.
Workers are demolishing the Pier-T off ramp from the Gerald Desmond Bridge as part of a $1 billion project to replace the aging bridge. The new structure will include two 50-story-high-towers and will be one of the tallest cable-stayed bridges in the country and the first of its kind in California, officials said.