As large highway systems began to be developed in the 1920s, long-distance road journeys became more common, and the need for inexpensive, easily accessible overnight accommodation sites close to the main routes led to the growth of the motel concept. Motels peaked in popularity in the 1960s with rising car travel, only to decline in response to competition from the newer chain hotels that became commonplace at highway interchanges as traffic was bypassed onto newly constructed freeways. Several historic motels are listed on the US National Register of Historic Places.