From 2004 when plans were announced until its completion in early November 2014, the Turnpike was widened along a stretch between Interchange 6 in Mansfield Township to Interchange 9 in East Brunswick Township in Middlesex County. Two new carriageways (to accommodate the outer roadways, or truck lanes) were built from Interchange 6 to Interchange 8A in Monroe Township, Middlesex County, and an additional lane on the existing outer roadways was added as well between Interchanges 8A and 9, bringing the roadway up to 12 lanes of traffic in a 3-3-3-3 "dual-dual" configuration of separate truck and car lanes in each direction.