CheckPoint System for a Racing Game.

Hi there,

Im struggling with my game and need a bit help.
Can someone give me some advice on how to make a basic checkpoint system for a racing game?
I searched the hole web and somehow i cant find anything.
I already watched the Time Attack Tutorial series from Epic(more than once) and i get headache from it. The tutorial is just bad.
Would be nice if someone can point me in the right direction.

Thanks in advance.

What do you want to happen at the check points?