Glider (in the slang of pilots - glide) - an extra light racing machine.
Why do we choose glider? Because smooth dynamical driving on speed limits above the surface is very similar to planning flight. It seems, as if you fly above a surface, pawning a bend, you feel whirlwinds of air at the ground, the wind whistles in your ears and eyes water from a counter stream. The wave of adrenaline really breaks off the roof. It seems that you drive the last time in your life, but on finish you realize that its yours: the squeal of wheels on turns, smell of the melted off brakes, fear which you have overcome and you are again on start.