The $119 million project was designed to relieve traffic in a chronically congested area that's home to many of San Diego's high tech and life sciences companies.
Workers built four miles of carpool lanes from state Route 52 to Mira Mesa Boulevard and a south-facing direct access ramp at Carroll Canyon Road. The ramp will allow carpools, vanpools, permitted clean air vehicles and motorcycles to directly enter and exit carpool lanes without weaving through regular freeway lanes.
The project was funded by the TransNet half-cent sales tax, along with state and federal money.
The facilities are scheduled to open to the public in about a week, according to the San Diego Association of Governments.
A ribbon-cutting ceremony is scheduled Thursday morning.