It is part of a £12m project to breathe new life into the station which is being carried out by Lancashire-based construction and development group Conlon.
The reopened section, pictured, means people can see how the concourse has changed following the opening of the first renovated section at the south east quarter of the bus station, near the Guild Hall.
The next section has now closed for similar work. The whole concourse will be renovated as part of the project and is due to be completed towards the end of this year.
Andrew Barrow, project manager for Lancashire County Council, said: “The work aims to respect the listed aspects of the building, while providing new glazing, lighting and much more. We’ve also got new bus bays, with a number of new safety features for passengers and bus operators.
"There's still a lot going on, and lots of improvements still to come, but we're very pleased with the progress that's being made."
The top four levels of the car park have also reopened following repairs and redevelopment, with work now taking place on levels three to five.
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