Autodrome de Linas-Montlhéry has the steepest bank of any racetrack in the world. Conical in cross section, the steepest driving position on the bank has 47 degrees of banking.
The model of the track was reverse-engineered from the attached architectural drawing.
For practical physics education a model was made with the same cross-section of the steepest bank, but a much tighter radius. When printed on a reasonably sized printer, this should allow a hot wheels car to travel on the track and use the banking at speeds far less than the 200 km/h that the bank is designed for (without wrestling the steering wheel). The astute physics student could use the maximum size of the printed model (whatever scale you end up using for your printer), and calculate the speed at which this would be. The smaller the car you can find, the better.
Unfortunately my CAD file is not available, however there are print-ready STLs available.
Note that the scale is most likely 1 inch = 1 meter. So if you import the STL into a program that is expecting 1 unit = 1 mm, you will need to scale it up by 25400 to get it full size. Full size the track should be 268m wide. I imagine most people will just be printing a section or the hot wheels track, in which case the practical size of the printer is determining the scale.