Definition:
The regular crossing of an external land border by border residents in order to stay in a border area, for example for social, cultural or substantiated economic reasons, or for family reasons, for a period not exceeding the time limit laid down in this Regulation.

Source:

• Regulation (EC) No 1931/2006 of the European Parliament and of the Council of 20 December 2006 laying down rules on local border traffic at the external land borders of the Member States and amending the provisions of the Schengen Convention
  Place of publication: (Dz. Urz. UE L 405 z 30.12.2006, str. 1—18)