The first motorway dates back to 1936, when the current A12 was opened to traffic between Voorburg and Zoetermeer, near The Hague. Motorway construction accelerated in the 1960s and 1970s, but halted in the 1980s. Current motorway expansion mostly occurs outside the Randstad, and very little construction has taken place inside the Randstad since the 1980s. Since 1991, only 100 kilometers of motorway have been constructed in the entire country, of which only 26 km lie within the Randstad metropolitan area.[14] The population has grown by 1.5 million since,[15] creating significant pressure on the motorway network