The road is the Autobahn 62 towards Trier and this particular M5 had the 250 km/h (155 mph) speed limiter removed. The driver pushed the pedal to the metal and hit 300 km/h (187 mph). However, he was a bit disappointed, as he couldn’t reach the M5’s 330 km/h (206 mph) top speed due to –ahem- traffic.
We bet that he won’t rest until he does hit the car’s actual top speed, so expect another video sooner rather than later. For the time being, you can watch the in-car 300 km/h run video after the jump.
Sources: Youtube via F10post
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