This provides ample time during which to do things like make inappropriate jokes without worrying about strangers overhearing, telling improvised scary stories that don't really have a climax but still end up lasting a rambling twenty minutes, and not bothering to actually have anywhere to go. Understandably, a lot of aimless drives end up at the local Denny's.
Remember, though, that the majority of unpopular girls don't actually have their licenses. This becomes troubling in the acquisition of a driver for these purposeless excursions, but once one is found, advantageous in that it often allows for the avoidance of actually paying for gas.