I answered
An "empty" spot is filled by a motorcycle, scooter or bicycle

Because it is the greatest illusion of a free space - you see it in the distance, pull off a few funky maneuvers to get there, cut off at least 1 other driver and exchange verbal abuse with another, only to stop short with your nose stuck a foot into the space before seeeing the motorcycle then not being able to get out becuase the other drivers you pissed off have now blocked you in.