Swerving in its truest sense, IS reckless driving. Whether or not you endangered others or yourself, it's still an offense.

This is analogous to disregarding traffic lights in that, whether or not there is oncoming traffic or not, you are required by law to stop at a red light.

How our traffic enforcers interpret swerving is another thing. For as long as you change lanes with turn signals flashing or not breaching any solid markings on the road and done in due care, it should not be considered swerving.