unity 3d : car keeps tilting over.

Unity Engine
1

im new to unity and im trying to make a game.
i dont know whats wrong.

here is a link to my work in progress :
http://tinyurl.com/T3DDY173JATEKTEST1

2

What is the car’s rigid body’s center of mass? It might need to be lower.

Also, have you considered using an alternative camera script, such as the SmoothFollow script?