We’ve seen Nissan engineers testing cars at famous race tracks such as the Nurburgring and Laguna Seca but that doesn’t mean they’ve stopped using their own private circuits. It seems testing behind the doors at Nissan has become so busy that a fifth test track was required. A new circuit at Oppama, Japan, has now been opened at a cost of €16.2 million.

The Oppama course stretches four kilometers in total...