SR 903 out of South Hill down to SR 615, then west until it nears US 1 where VA 31 cut SW to cross the Roanoke River on a private toll bridge. VA 31 then followed SR 711 to Palmer Springs, then either SR 712 over to VA 4 where it then dipped into North Carolina or SR 713 southeast to the current US 1 crossing US 1 entered Virginia where it does now, then used SR 713 to Palmer Springs, then SR 711 NE to cross the Roanoke River on a private toll bridge very near the current US 1 bridge, connecting up with SR 903 which US 1 followed to South Hill.
US 1 used Pace Drive, current US 1, then VA 138/SR 638 to Forksville; SR 639 (no longer crosses Meherrin River); SR 710; US 1 to Alberta; SR 606/642; US 1; SR 630 Waqua Creek Rd; SR 629 Rawlings Rd; US 1 did not use SR 1009 into McKinney and was using the current corridor over to DeWitt except the SR 649/650 loop. It appears US 1 followed the current corridor into western Petersburg. US 1 used Washington St to Sycamore north ot Riverside east to current US 1's crossing of the Appomattox River.

US 1 to N.C. via Forksville and SR 903
1926 Auto Trails

Hull St Bridge 1923 Auto Trails

9th St Bridge 1927 Official

Hull st bridge again 1930 Official

9th st bridge again 1932 Official

In July 1933, VA 31 was dropped from the entirety of US 1.
In April 1934 (CTB), US 1 was rerouted in Richmond to use Belvidere across the James River, then Broad St west to Lombardy north to Chamberlayne.
In Dec 1934 (CTB), US 1 was placed on its modern routing in Central and Northern Stafford County including Quantico MCB.

About 1935, US 1 was reomved from SR 1425 and what became an extended VA 145. Also in this timeframe US 1 was given its modern routing through the Fort Belvoir area.
By 1936, US 1 was removed from Fordson Ln and Old Richmond Hwy approaching Alexandria.
In Sept 1937 (CTB), US 1 was removed from Hanover SR 641.
In 1943, US 1 was given its current Rappahannock crossing leaving behind a bit of SR 607 in Falmouth.
In June 1947 (CTB), US 1 was rerouted in Alexandria to replace what had been US 1 ALT - Patrick St, Wilkes, Henry, and Old Georgetown Rd (now part of Henry). The old route using Franklin, Washington, and Powhatan was taken out of the primary system.

Initial Alexandria routing 1929 Official

US 1 moved to Henry St 1948 Official

In Aug 1951 (CTB), US 1 was rerouted through Petersburg: NB followed Washington to N. Adams (had been US 1 ALT) to Henry St to 3rd St to Bollingbrook west to the Appomattox Bridge location; SB used Bollingbrooke west to N. Sycamore St north to Grove Ave west to Market south to Washington.
In Nov 1953 (CTB), US 1 was placed on one-way splits in Richmond: NB used Broad St, Bowe St, Moore St, Lombardy St; SB used Lombardy St and Broad St. I have yet to find a Richmond map that shows the US 1 and US 60 routings used throughout most of the 1950s.
In Oct 1954 (CTB), US 1 was placed on its current routing through Crystal City.
At some point after 1958, US 1 was operationally placed on one-way splits in Downtown Fredericksburg with NB using Caroline St/Herndon St and SB using Princess Anne St.
In Sept 1959 (CTB), US 1 was given its current routing through Richmond with the completion of Chamberlayne connecting to Belvidere directly.

Richmond routing 1934-53 1935 Official

Richmond routing since 1959 1961 Official

It appears that around 1960, US 1 was given its one-way splits with Patrick and Henry Sts. in Alexandria.
In May 1971 (AASHO), US 1 was moved to the Fredericksburg bypass, replacing US 1 ALT. The old route through downtown Fredericksburg became US 1 Business.

US 1 through Fredericksburg 1948 Official

US 1 replaces US 1 ALT around Fredericksburg 1971 Official

About 1976, US 1-460 was placed on one-way splits using Washington and Wythe Sts

Initial Petersburg routing 1936 Official

more complicated Petersburg routing 1959 Official

Washington/Wythe splits 1976 Official

Improvements:  Upon designation in 1926, US 1 was fully paved from Dinwiddie to Washington DC except for a brief section south of Stafford CH
In 1927, US 1 was paved from North Carolina to Dinwiddie.
In 1932, US 1's Stafford section was paved.
Note that widening of US 1 for 3-laning began as early as 1931.
The First segment of US 1 to be 4-laned was the split north of Stafford CH, in 1933 (NB bridge date).
By 1937, US 1 was multilaned from VA 10 to Richmond.
In 1938, US 1 was multilaned at least Ashland northward to the S. Anna River
By 1941, US 1 was multilaned from Petersburg to Washington except near Four Mile Fork to Stafford SR 628; Woodbridge area
By 1947, US 1 was multilaned in the Woodbridge area.
In 1951, US 1 was multilaned 3 miles around the Meherrin River; a segment by Brunswick SR 712; DeWitt north a short distance.
In 1952, US 1 was multilaned from VA 46 past Alberta; DeWitt to Dinwiddie
In 1971, US 1 was multilaned when placed on the Fredericksburg bypass.
In 1992, US 1 was multilaned on its US 58 duplex.
In 2005, US 1 was widened to 6-lanes in the SR 8900 Centreport Pkwy area
In 2013, US 1 was widened to 6-lanes through Triangle
In 2016, US 1 was widened to 6-lanes from SR 610 south of Dale City to just past SR 2000 Opitz Blvd Woodbridge
In 2020, US 1 was widened to 6-lanes from Mary's Ln to just north of VA 123 in Woodbridge
In 2023, US 1 was widened to 6-lanes from just past SR 2000 Opitz Blvd to Mary's Ln in Woodbridge
The parts of US 1 that are not 4-laned from North Carolina to Petersburg are 3-laned (some now have the center turn lane setup) with the exception of a small section from the state line northward.
US 1 is 6+ lanes from VA 150 to Overbrook Rd in Richmond (about 12 miles); Azalea Rd Richmond; VA 73 to Hanover SR 656; about a mile from I-95 Exit 126 southward; 1/2 mile in the vicintiy of SR 8900; through Triangle; SR 610 south of Dale City to just past VA 123; 3/4 mile in Lorton; VA 235's northern jct to the RR bridge north of Old Town Alexandria; Reed Ave to Washington DC

Posted:  Fully posted although at times hard to follow through Petersburg; The only US 1 cutouts remaining in the recent era were NB after both VA 7 and VA 236 in Alexandria, with only the one north of VA 7 still up as of Oct 2022. Richmond cutouts were gone by 2003. The only VA 1 error shield I've ever seen was at VA 54 in the 1980s. A second one has cropped up much more recently on SR 903 appeoaching SR 615 in Mecklenburg County. Vintage white border shields existed in Alexandria into the late 1990s. Multiplexes:  US 58 (3.43 mi) US 58 Bus (2.81 mi) US 460 Bus (4.95 mi) US 460 Bus, VA 36 (0.20 mi) US 301 ALT, US 460 Bus, VA 36 (0.20 mi) US 301 ALT (0.45 mi) US 301 (incl triplexes) (26.08 mi) US 301, VA 144 (1.94 mi) US 17 (1.18 mi) US 17 Bus (0.46 mi)

VA 1 error shield photo by Juan Milford, 9/21/23

Legislative names: Jefferson Davis Highway, US 58 duplex; SR 712 to Washington DC (3-17-22 designation predates US 1); Blue Star Memorial Highway , Occoquan River to VA 235 (4-3-90); Purple Heart Trail, I-95 Exit 161 to VA 235 (4-8-98); Washington-Rocheambeau Highway, Fredericksburg to SR 611 Occoquan River; SR 611 Pohick to VA 235 (3-6-80)
Spanish-Amercian War Veterans Memorial Bridge over Rohoic Creek in Petersburg (3-12-38); Dr. Martin Luther King Jr Memorial Bridge over Appomattox River (4-16-92)
Other names:  Danville St/Mecklenburg Ave (South Hill); Boydton PLank Rd (Brunswick and Dinwiddie Co); [Wythe St/Jefferson/3rd St/Bollingbrook St/2nd St NB]/[Bollingbrook St/Sycamore St/Old St/Market St/Washington St SB] (Petersburg); Boulevard (Colonial Heights); Cowardin Ave/Lee Bridge/Belvidere St/Chamberlayne Ave/Azalea Ave (Richmond); Brook Rd (Henrico Co); Washington Hwy (Hanover Co); Fraley Blvd NB/Main St SB (Dumfries), Richmond Hwy (Fairfax Co); Patrick St NB/Henry St SB (Alexandria)
Scenic Byway:  No segments
Truck Route: US 1 SB has a truck route posted in Petersburg, following US 301 ALT south to US 460 Bus east.
Comments: Historically the most important road on the East Coast, it has been pretty much superceded in Virginia by I-95 and I-85. It still provides a great low-traffic, four-lane alternative between Fredericksburg and Richmond. Above Fredericksburg, though, it's one stoplight after another. The last 55 mph section is a 2-mile segment between SR 624 near Falmouth and SR 628 south of Stafford CH.
Until 1998, US 1 in Dumfries had an interesting alignment. The road split far apart. US 1 NB was straight and 2 lanes in the same direction. US 1 SB was quite crooked, and for half of it was two-way traffic, with only 1 lane in each direction. This created a bottleneck everyday during afternoon rush. VDOT added a second SB lane in 1999.
US 1 had the last known suicide lane setup in Virginia, a little south of US 58, where both directions could come to the middle to pass. This was finally changed before early 2004. Here is a picture - thanks to Gribblenation