Cruise at top speed for 2 minutes straight without damaging your car.

I recommend getting a D class car for this. The gopher is a good one as it is slow and versatile. You can also choose a van. Head onto the highway and reach full speed in your selected vehicle without crashing into anything. After about 5 seconds of cruising. The safe driver timer will appear in the right hand bottom corner. Keep track of the time and stick to the highway.