VA 350 under construction July 1949 Va. Hwy Bulletin

VA 350 final product July 1949 Va. Hwy Bulletin

In Feb 1951 the CTB rejected requests to continue to restrict trucks from using VA 350 once the road was 4-laned to US 1.
In Aug 1951 (CTB), VA 350 in its entirety was placed in the 50,000 pound system, opening the way for trucks to use the road which was 4-laned in May 1952 (Kozel).

VA 350 initial opening 1946 Official

VA 350 extended to VA 236 1949 Official

VA 350 extended to Woodbridge 1950 Official

In Oct 1953 the CTB voted to have the policy not to permit the construction by individuals, companies, or private corporations, of service drives within the ROW of the Shirley Memorial Highway.
In March 1955 the CTB voted to accept a proposal from the Bureau of Public Roads to transfer maintenance of the Pentagon Road Network, to include the northern 5 miles of VA 350, to VDOH. The BPR obligated itself to make certain improvements prior to the transfer.
In Aug 1958 (CTB), 13.2 miles of VA 350 was officially made part of the Interstate System from 1.47 miles north of US 1 Occoquan Bridge to the NCL of Alexandria which was at VA 7.
In Sept 1959 the CTB rescinded its March 1955 action to accept the BPR offer to relinquish responsibility of the Pentagon Road Network, as the BPR was unable to secure congressional funding to do the improvements that were part of the agreement. VDOH and BPR had no agreement in place over interstate system financing for VA 350 and VDOH was unwilling to accept the additional cost of this without further study.
In Sept 1961 (CTB), a congressional bill was enacted that would fund VA 350 north of VA 7 as part of the interstate system with the federal government paying 95% and the state 5%. It was also agreed to widen VA 350 to 8-lanes on this northern stretch and the bill contained money to do the improvements around the Pentagon that the BPR was supposed to do in the 1950s. VDOH would then accept maintenance responsibility once the improvements were made.
In Dec 1964 (CTB), the improvements were completed and VDOH received responsibility for the Pentagon Road Network. The CTB then placed VA 350 from VA 7 northward into the interstate system specifically as I-95.
The last CTB reference to VA 350 being present was Jan 1966, describing it as "being converted to I-95". The last Official map to show a VA 350 shield was the 1965 issue and it is not shown anywhere on the 1967 Fairfax County map.
VA 350 was widened to 6-lanes as part of its conversion to I-95 from Woodbridge to Springfield. Work to widen I-95 further north was largely done after VA 350 was decommissioned. VA 350 had the same interchanges that I-95 and I-395 have now, only most were simple folded diamonds or parclos. Only VA 236 (full clover) had a more advanced interchange south of the Pentagon Road Network. Today, only the SR 642 interchange at Lorton and the Shirlington Circle interchange (ignoring the HOV ramp) are essentially in the same configurations as originally built.

VA 350's interchange with SR 644 Springfield July 1949 Va. Hwy Bulletin

VA 350's interchange at Shirlington Circle 1949 VDOT Richmond-Petersburg Transportation Study

VA 350 had four features that have been removed: 1. The most well known is the at-grade rail crossing just north of Shirlington Circle. Per Kozel this was resolved when the railroad owner went out of business in 1968. Since technically this couldn't be I-95 until the at-grade was resolved, the portion of Shirley Highway between Shirlington Circle and VA 120 may have been VA 350 until then. 2. Squeezed in between the SR 642 interchange and Pohick Creek was a bridge crossing a rail spur from the tracks on the east side (essentially where the Auto Train station is now) that led to Lorton Prison and also a brick plant across the river from the Town of Occoquan (now a sewage plant). It appears the bridges were widened to 6 lanes and may have lasted until HOV construction in the early 1990s. There is no sign of this railway today. 3. Northbound on VA 350 at where the slip ramp for I-95 NB to the HOT lanes before VA 286 there was a wayside/rest area/weigh station (hard to tell from historic aerials exactly what - although there are no buildings there). This area is now covered by the current I-95 NB lanes and looks to have disappeared when Shirley Hwy was widened to 6 lanes. 4. Southbound on VA 350 just south of the current fire station south of VA 289 was a second wayside/rest area/weigh station/whatever. It is partially covered by I-95 SB lanes. This was removed about 1963. The Pohick Road overpass used to be 700 ft south of where it is today. VA 350 was featured on the front cover of Official maps from 1950-53. Note that the NB lanes of VA 350 are largely covered by the reversible HOT lanes from near Woodbridge all the way to the Pentagon area. The Historic Aerials site has a 1949 view of much of the Shirley Highway - link.

VA 350's railroad crossing north of Shirlington Circle (late 60s) Fairfaxunderground.com

A terrific VDOT video comparing part of VA 350 in 1949 to I-395 today is available - here. Two still shots are below...

Advance signage for VA 236 exit at VA 350's interchange with Edsall Rd 1949 Video by VDOT

No Trucks allowed on VA 350 1949 Video by VDOT