There is a real crossroads to set something, the north-south trunk road in both directions, to ensure the safe passage of vehicles at every entrance of each trunk group set up two digital display devices and four sets of red, green and yellow lights were used to indicate the direction of things straight, straight north-south direction, the direction of the turn and the north-south direction things turn also features a state of emergency treatment, digital display can have manual control, and has initialization function.

VHDL.doc

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