Ever wondered what those test-drivers seen in spy images really do? If you answered yes, then General Motors' Cadillac Driver’s Log is probably worth a look into. The site features comments from the actual test-drivers for the new CTS sedan as it underwent pre-production work all over the world.

You can learn about how they calibrated the new AWD system in the near-Arctic snowfields of Sweden or how they measure traction and stability with a device mounted to the nose of the car. We also want to hear about running-ins with spy photographers and those times where someone in the dev team has crashed a million-dollar prototype. Let's hope we see more of these kinds of sites pop up from the other manufacturers.