sentences:  In the 2000s, WSDOT began long-term planning for the SR 546 corridor, including determining replacements or retrofits for several intersections in northern Lynden that were the site of several major collisions in the early 2010s.Two roundabouts, located apart at Depot Road and Bender Road, were constructed in 2013 using $5.6 million in federal border funding.Construction of a third roundabout, located at Northwood Road, was completed in July 2016 and required road traffic to be restricted to alternating, one-way patterns.