Game Race AS 3.0, help me

i need help.
i want to create game for my final project. i use AS 3.0 for language.
i need your help, i want create game similar to this:
http://www.ipermainan.com/game/6378/boat-rush
how road can run?
the right and left limits from small to big… like run…
how…
please…
please… give me some refrence, or tutorials…
i need your help.