Does the trachea bifurcate into the main bronchus at the sternum?

No, the trachea bifurcates into the main bronchi at the level of the T5 to T7 vertebrae, not at the sternum. The point of bifurcation is known as the carina, which is located just above the sternal angle. The trachea runs vertically in the neck and thorax before splitting into the right and left main bronchi to enter the lungs.