The entry outlines the line connecting Herzliya and Ramat Hasharon through Tel Aviv and Petah Tikva to Ben Gurion Airport, forming a semi-ring that links all three metro lines. Wikipedia lists planned stations, interchanges with M1 and M2, and the planning history that started with government decisions in the 2010s. It explains how the line should feed major employment zones and ease private-car use. The page is updated with planning changes and links to official maps.