(KRON/BCN) — A $50 million project to add new highway connections near Antioch has been completed after nearly three years of construction work, county transportation officials announced Monday.

Elected officials and Contra Costa Transportation Authority leaders gathered today to celebrate the opening of connector ramps between state Highway 160, the Senator John A. Nejedly Bridge and state Highway 4.

The Senator John A. Nejedly Bridge connects Antioch to southern Sacramento County. The bridge is part of Highway 160, which meets Highway 4 between Oakley and Antioch.

Construction on the ramps began in March 2014 and was initially expected to be completed late last year before it was delayed.

The project was funded through the Bay Area Toll Authority and is part of a larger $1.3 billion undertaking by the CCTA and its partners to improve Highway 4 infrastructure in eastern Contra Costa County and to extend BART to Antioch.