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The last leg of Interstate 95 in Rhode Island opened Nov. 21, 1969. (Prov. Journal-Bulletin, 8/30/99)
I-895 (numbered as another interstate) Delaware (link)
A temporary renumbering for an under-construction segment of I-95 in Wilmington circa 1980. Soon after nearby I-495 opened in 1977, the I-95 viaduct south of downtown Wilmington needed major rehabilitation. The viaduct is a twin-span elevated structure about a mile long. DelDOT closed one span at a time, and maintained two-lane two-way traffic on the other span, while the closed span had the old bridge deck removed, replaced, and widened. During the 2 1/2 year project, I-95 became I-895, and link(495ri) became I-95.
Scott Kozel writes: "That was logical, because part of the real I-95 had only two lanes for the duration of the project. I'm not sure of the exact date range of the construction, but my best recollection would be from 1979 to 1982." 
Chris Blaney reports seeing a 1964 planning map showing the I-95 viaduct as I-895, and the proposed link(495ri) route as I-95. He offers three possible explanations for this: 
...how can this explain the 1964 dated map with this "temporary" designation, 15 years before it happened? A few come to mind.A March 2000 bill in the Delaware legislature aimed to permanently change the I-95 viaduct to I-195, and the I-495 bypass to I-95. .
Why an odd starting number for a highway that's not a spur? Wilmington city residents believed this would help decrease traffic in the area, as I-195 would connote that the road is for local traffic. 
I-895 Maryland (link)
11.44 miles ; Harbor Tunnel Thruway in Baltimore. The Thruway was part of I-95 until about 1981 . The Harbor Tunnel itself opened on Nov. 29, 1957 .
I-895 (cancelled) New Jersey; Pennsylvania (link)
This was once a proposed 6.4-mile Delaware River crossing northeast of Philadelphia, from from the I-95/PA 413 spur interchange in Croydon, Pa., bypassing Burlington, N.J. to the west, and ending at I-295 south of the NJ 541 interchange (Mt Holly - Burlington Rd.)  
In 1975, the highway was still planned; the location was approved, but design was delayed. The Burlington County Bridge Commission opposed the project, preferring to build a new toll bridge. 
In the late 1970s, $180 million earmarked for I-895 was traded in for a several local road projects, including the Exton Bypass, the Newtown Bypass and the Pottstown Expressway.  Interstate 895 was cancelled in 1980. 
See also: I-895 (Steve Anderson)
I-895 (numbered as another interstate) New Jersey; Pennsylvania (link)
I-895 is an old number for the Vine Street Expressway, today's I-676. In 1958 it was renumbered to I-80S;  in 1964, I-76; and in 1974, I-676.
I-895 New York (link)
1.12 miles ; Sheridan Expressway connecting I-95 and I-278 in the Bronx. It was originally part of I-278, before I-278 was rerouted east along the Bruckner Expwy to I-678.
New York (and Robert Moses) had planned to extend the Sheridan (as I-278) northeast another 6 miles to I-95 at exit 10, to help New England-bound traffic. However, community groups and benefactors of the Bronx Zoo (in the highway's path) acted to stop work on the road in 1962. In 1972, Gov. Rockefeller declared the Sheridan extension dead. 
I-895 (cancelled) Rhode Island; Massachusetts (link)
Proposed eastern beltway for Providence, from I-95 at RI 138 in Richmond to the I-95/I-295 interchange in Attleboro, Mass. Added to the interstate system in 1968, it was rerouted in 1971, and was cancelled in 1982.   
The 1968 proposal started I-895 near the I-95/RI 37 interchange in Warwick, circling east then north (along RI 136) to I-195 near Exit 2 in Massachusetts; then north to intercept I-95 at I-295. The 295 interchange is a "half-cloverleaf," with space left for the 895 roadway and ramps. The 12.2 miles from I-95 in Warwick to I-195 was priced at $114.8 million in 1970. 
The route was originally to be part of Interstate 295 when approved in 1968. But on June 21, 1971, possibly because of uncertainty over its alignment, the number was changed to 895. 
Warwick route alternatives
At the time, there were three alignments contemplated. Each would extend eastward from RI 37, which opened in October 1965. . These were:
The proposed segment through Warwick met strong opposition. In October 1971, Rhode Island lobbied for a rerouting of its portion of 895, creating a longer route through Newport as follows:
The Fall River route
There was another plan to connect I-895 to I-195 at Fall River using RI/MA 24.  This plan probably omitted the connection further north to I-95. An Environmental Impact Statement (EIS) submitted for I-895 included the RI 136 route and the RI 24 route. 
What was built
Signs of the planned I-895 are still visible. There's a "New England cloverleaf" where the westbound RI 138 ends at US 1; a roadway continues for about 1/4 mile into the deep woods of North Kingstown. Leading east from there, RI 138 is a freeway for most of the way into Newport. (The final portion of this freeway was completed summer 1996 when the section across the island of Jamestown was finished.)
The $160 million Jamestown-Verrazzano Bridge, which was to be part of I-895, was built after 895 was cancelled, though using funds allocated for it. 
VA 895 VirginiaVirginia State route 895 is an 8.9-mile, four-lane, $324M connector proposed for some time between the Chippenham Parkway (VA 150) and I-295 in the Richmond area, to allow easier airport access (it's the only bridge across the James River between I-95 and I-295).  Route 895 was completed on Sept. 20, 2002. 
Although this page (among others) has referred to the highway as Interstate 895, and it was constructed to Interstate standards, it will actually be called state route 895 for the forseeable future. 
See Scott Kozel's excellent pages for more 895 history, updates, and photos: