Drafting on cars

There was a display with 3 different type of vehicles in wind tunnels with mist to make  to show the turbulance on vehicles.  It was really cool go see the different turbulance on car a trcuk and a helicopter.  I didnt know that the different wind reaction  could create such a different movement in the vehicles. The coolest was the the heicopter which didnt really move the air much which is good because the air flow should come from fan blades.