These icons () show footnotes as tooltips... for some browsers.
I-795 (future) Florida
I-795 is the future number for a three-mile spur from I-295 (southeast quadrant) to I-95 between exits 96 and 97 near Jacksonville. Neither has been built yet.
Jacksonville already has an I-295 bypass to the west. Recently the state has constructed portions of the FL 9A expressway bypassing the city to the east, and connecting with I-295; when this is done, the entire loop will be numbered I-295.
There's still no info at the FLDOT website about the 795 numbering. A November 2002 Times-Union (Jacksonville) article said the road might be numbered I-395 , which is mistaken since there already is one in Florida.
8.99 miles ; Northwest Expressway; northwest from I-695 to MD 140 (Reisterstown Pike, formerly US 140) in Reisterstown. The 6-mile section from I-695 to Owings Mills Blvd opened around 1984. The Baltimore Metro Rapid Transit railway, which runs in the median for those 6 miles, opened in 1987. The remaining 4.8 miles, with 4 lanes, opened in 1986; that's when the I-795 designation was applied. 
I-795 was planned to travel further east inside the Baltimore Beltway near Wabash Avenue but was killed (late 1970s) by local opposition.
Because of the commuter rail line, trucks over a certain gross weight are prohibited from using the inner lane in both directions. 
See also: I-795 (Scott Kozel)
I-795 (numbered as another interstate) Virginia
Once-proposed 5.3-mile renumbering for I-95 south of Petersburg . Basically the planned I-295 would have connected to I-85; and instead of being called I-295, it would carry I-95 from Richmond and the north end of I-85.
The leftover parts of I-85 and I-95 leading into Petersburg would have been called I-385 and I-795.
Here's some background from Scott Kozel:
"VDOT got approval in the late 1970's to build a new interstate corridor to parallel the Richmond-Petersburg Turnpike (RPT). The RPT was designated with I-95 for most of its length, and with I-85 on the southern 4 miles. The RPT was a state-built tollroad, opened in 1958; no FAI funds were used. The new interstate would provide a new I-85 and new I-95, south and east of Petersburg. The RPT would have had the interstate signing removed, and become a state route. Two sections of FAI interstate leading to the RPT would have been bypassed also; about 3 miles of I-85 west of Petersburg would have become I-385, and about 4 miles of I-95 south of Petersburg would have become I-795. I-295 northeast of Richmond would have become I-95, and I-95 from I-295 to I-195 would have become I-195; e.g., what today is the I-295 bypass of I-95, would have been I-95.
I-795 North Carolina
25.41 miles ; from I-95 in Wilson, N.C. to US 70 in Goldsboro, N.C. This new route overlaps the US 117 freeway between those points.
Around 2001, officials in Goldsboro were proposing what they called Interstate 795, which would incorporate improvements to US 117 to create an interstate link from I-95 to I-40 (through Goldsboro).  This proposal lay dormant for a few years, not appearing in applications to AASHTO or the state's own 2004-2010 TIP.
NCDOT submitted an application for the I-795 designation in early 2007, for the portion of US 117 freeway that was already constructed, from I-95 to US 70. AASHTO rejected it, citing that I-795 failed to meet the criteria of beginning and ending at another interstate highway.  As the proposed I-795 route was perfectly in line with its role as a spur, this reasoning is a bit puzzling. Bob Malme cites more sensible reasons: I-795 was not yet on a list of FHWA future interstate corridors, and a segment of US 117/264 freeway was prone to accidents in wet weather 
NCDOT worked with the FHWA, and also let a contract to repave the slippery area near Goldsboro  In August 2007, NCDOT resubmitted the I-795 application to AASHTO. In the application, NCDOT cited the need for a bypass route in the area, as well as a route from I-95 to Seymour Johnson Air Force Base, as reasons to approve I-795.  NCDOT also noted that the interstate designation would open up US 117 to serve more truck traffic; trucks longer than 48 feet are not allowed on a non-interstate highway .
I-795 was approved by AASHTO's Route Numbering Committee on September 29, 2007.  New signs began to go up in November.  An extension southerly to I-40 is planned, but is currently not funded. 
I-795 (unknown history) Virginia
Two late 1980s maps have shown a proposed I-795 in Petersburg, Va.: a 2-mile east-west road leading from I-95. Around 1988, this appeared in a Commonwealth of VA map. However, the next year the map revealed a completed non-freeway, Wagner Rd . In 1989, so-called I-795 appeared in the DeLorme Virginia Atlas and Gazetteer.