  In some countries, cars and motorbikes are allowed to pass through the same
road. We observe a phenomenon similar to a Brazil nut effect (BNE) that
frequently occurs on such roads, in which motorbikes (representations of small
particles) segregate in front of cars (representations of large particles),
although the motorbikes are initially located far behind the cars. Deep
investigations of the BNE-like phenomena in such roads are reported here, where
a combination of aerial views using a quad-copter camera and simulations is
studied. We show for the first time that most phenomena observed in common BNEs
are also observed in such roads.
