Divider

A divider is a polygonal surface on a road section, included at splits or merges of roads, lanes or carriageways.
Dividers may not be used. Only if a divider is in a rush-hour lane, drivers following this rush-hour lane may drive over the divider.

Article 1 of the RVV:
Divider: an area having several corners, on the road surface, at points where roads merge or diverge.