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We build the model of Modified CA(cellular automata) to analyze the right-hand drive principle, at the same time we put forward the New Principle (In the principle, right lane is the high-speed lane and vehicles driving on it normally. This paper divides the whole principle process into four stages. The overtaking vehicle (A) send signals to the overtaked one (B),B moves to the low-speed lane to let A pass, A moves straight to finish overtaking and B returns.) and its creation is optimized by the model. At last, we use the model to analyze the traffic conditions in different principles or vehicle density or speed limit.

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