A median, also called camellón, island or central lane in some areas of Latin America,[1]​ is a dividing strip located in the middle of a road that has the purpose of physically separating the two directions of traffic, preventing the passage between lanes in the opposite direction.[2]​.

In Spain, the General Highway Regulations define the median as:[3]​.

It usually consists of a curb of a certain height that makes it impossible for a vehicle to enter the opposite direction in areas not authorized for this, such as intersections or roundabouts. The same term is used on highways and highways to designate the space between both directions of traffic. Medians are usually filled with concrete, although sometimes they may contain plants or even trees as decorative elements.