Solving "flickering" shadow problems.
At bigger tracks you will notice that rfactor is having problems with shadows, that seem to switch on and off. Resulting in a stroboscopic effect.
To counter these problems alter the values of the clipplanes in the *.cam and scn files, by raising them in a large amount. In the *.cam file you have to do this to all the tracking camera's.
Add also the line: "MaxShadowRange=(800.00)" to the SCN file. Place it below
Also this solves the problem notably. What it does is preventing objects outside 800m to create shadows. Change the value at your own taste.