Sec. 200. "Worksite" means a location or area upon which:
(1) a public purpose construction or maintenance activity; or
(2) a private purpose construction or maintenance activity that is authorized by a governmental agency;
is being performed on a highway. The term includes the lanes of a highway leading up to the area upon which an activity described in subdivision (1) or (2) is being performed, beginning at the point where appropriate signs directing vehicles to merge from one (1) lane into another lane are posted.