The Department of Infrastructure says a sports car manufacturer didn't test its latest model on closed roads.
Porsche came to the Isle of Man with its new 2019 911 GT3 RS to show off to journalists, along with two-time TT winner Steve Plater.
A Freedom of Information request asked the DOI whether it had closed the road or allowed the cars through in April while it carried out TT preparation work.
In response, the DOI says the cars didn't venture onto closed roads.
Two Manxman crossings called off
New warning for coastal overtopping at high tide
Government wants to re-roof governor's home
EVF to roll out body cameras to all Island stores
Good news for Island's Vinted sellers!
Ferry sailings under threat this week
Mountain Road gritting gets underway
Civic Amenity Site issues statement after former manager admits fraud