This brings memories and here is a story from my younger days;
During early/mid '80s Mercedes-Benz had a test site for several years at my homeplace in mid Norway. The joke among people was that our place had the badest roads in the country, perfect for test driving.

Partly correct because they chosed the worst road we had there, but I'm sure other places would fit for that purpose as well. However, this is a small place with about 2000 citizens at the time and it's peripheral from the passing interstate giving them better anonymity and peace for their activities. I didn't have much interest in the bulky MB's at that time until the W201, W124 and R129 showed up. The R129 even carried cladding/elements since it was a new model to be launched in 1988.
They rented the old technician/machining school (where I went for a year as well) as their offie and used the local gas station & workshop right next for fuel and repairs. They also had their own truck with a retractable lift inside, a very special vehicle. The test driving was on a narrow, winding, gravel road up in the mountaines, but they followed the speed limits and traffic rules and kept high respect for the local traffic and the locals living along the road. If they met another vehicle and couldn't pass or stop - they simply drove into the ditch and even straight into the woods a couple of times. IIRC they damaged two cars and towed them back to their test site, up on that "retractable lift-truck" and off it went to the fatherland, and a new test mule arrived shortly after.
I had a Renault 5 Turbo 2 at that time and I once followed them for fun. The road version of the R5T2 is close to a rally car with softer suspension and less power, and despite my low skills I felt big and thought that would be an easy-peasy drive, but no - they just disappeared, I had no chance to keep up with them.
I came across an image from October 1986 on Faceplant.
