Edge delineator posts for one-way carriageways

The image shows the left- and right-hand reflectorised delineator posts used at the edges of a one-way road or a one-way carriageway. They help drivers perceive the road margins and alignment in daylight and darkness, especially in poor visibility. They are not placed in the centre of the carriageway, do not divide it into lanes and do not mark reserved parking. Their reflector arrangements distinguish the two road edges.