Bowling Green and thence along that U.S. Route to the Governor Harry W. Nice Memorial Bridge. US 1 passes through Golansville, Ladysmith, and Cedon before entering Spotsylvania County. The highway crosses the Matta River south of Thornburg and the Po and Ni rivers to the north of the hamlet. US 1 passes through Massaponax, the site of Massaponax Baptist Church, then expands to a six-lane divided highway at Spotsylvania Parkway, which leads to Spotsylvania Regional Medical Center. The U.S. Route is joined by US 17 (Mills Drive) south of their five ramp partial cloverleaf interchange with I-95, where US 17 joins the Interstate to bypass Fredericksburg. US 1 continues with four lanes to Four Mile Fork, where the highway meets the northern end of SR 208 (Courthouse Road) and the southern end of US 1 Bus. (Lafayette Boulevard), which serves the Fredericksburg Historic District and the Fredericksburg Unit of Fredericksburg and Spotsylvania National Military Park. US 1 continues north flanked by service roads to where it enters the independent city of Fredericksburg. The highway meets SR 3 (William Street) at a cloverleaf interchange, passes under a pedestrian bridge along the edge of the University of Mary Washington, and crosses over the Rappahannock Canal. US 1 meets the northern end of US 1 Bus. and US 17 Bus. (Princess Anne Street) immediately before US 1 and US 17 Bus. cross the Rappahannock River into Stafford County. Fredericksburg to the Arlington–DC border US 17 Bus. diverges onto Warrenton Road at a four-way intersection that also serves as the western end of SR 218 (Butler Road) in the center of Falmouth and its historic district, which contains Gari Melchers Home and Studio, Conway House, Union Church and Cemetery, Carlton, and Clearview. US 1 has a grade-separated junction with SR 8900 (Centreport Parkway), which serves Stafford Regional Airport, before crossing Potomac Creek. The highway passes Stafford Training School and passes through the county seat of Stafford. North of Stafford, the highway briefly divides into two carriageways with a wide median. The directions of US 1 come back together and approach I-95; ramps to and from northbound I-95 connect directly with US 1 as part of the Interstate's cloverleaf interchange with SR 610 (Garrisonville Road) just west of the historic Aquia Church. US 1 crosses Aquia Creek and passes through the village of Aquia. North of Aquia, US 1 enters the property of Marine Corps