sentences:  The Lynden section was replaced with a southerly route and re-designated as a branch of SSH 1B in 1957.During the 1964 state highway renumbering, SR 546 replaced the SSH 1B branch, while the rest of the highway became SR 539.Between 2013 and 2016, the state government built a set of three roundabouts on SR 546 in northern Lynden to replace intersections that had been the site of major collisions.