Airport Surface Friction Tester
This Saab was used at the airport in Bornholm for many years.
The boot has been converted with a fifth wheel, that can be lowered onto the runway. A brake is applied, in order to measure the surfaces friction.
Before an incoming plane arrived, the car could be deployed to see if there was an issue during sub zero temperatures.
Airstrips without tarmac need to be maintained, and it wasn’t unusual to see a steamroller on the runways, keeping them flat and firm.
When the german occupation force left the island of Bornholm, they left a defective steamroller behind. It was later repaired with a radiator from a Guy Motors lorry, and continued to be a part of Bornholm Airports equipment for several years after the war.