The race track at Vallelunga on the outskirts of Rome in Italy is the place where Biaggi won the first WorldSBK race staged there in 2007 as well as announcing his retirement in a special event that was held at the venue late in 2012, after winning his second world title.
On Tuesday, the Aprilia Racing Team used the track for a single days testing with Biaggi enjoying his return to the circuit.
"Well, this is like a return to the past for me," Biaggi said.
"It was here, some years ago, that I announced the end of my sporting career. Obviously, I have mixed feelings being back here now. On the one hand, there is a great desire to be riding bikes, and on the other hand there are memories from a previous chapter in my life. They are nice memories, though, and I'm able to think about them with a smile."
Biaggi works for Mediaset in Italy as a commentator but is also used by the Noale-based Aprilia factory to test its bikes.
"I am helping to develop the Superbike," the 43-year-old adds.
"We are continuing the programme, making a few small changes along the way. Thailand is going to be quite a mystery, with high temperatures which could cause some problems. For this reason, we are trying to prevent possible issues," he added.
The second race in the 2015 calendar will take place across the weekend of March 20-22 at the Chang International Circuit in Thailand.