Construction on the $161 million project began in 2008 and is expected to be completed in early summer 2013.
The project is about 80 percent complete, said Caltrans Public Information Officer Kelly Markham.
The goal is to allow motorists to seamlessly transfer from carpool lanes on Interstate 5 to carpool lanes on Highway 14 without having to exit to regular driving lanes, Markham said.
Read more here: Newhall Pass freeway lanes to open in 2013