Florida (PART 1/PART 2/PART 3/PART 4/PART 5/PART 6)
Georgia
South Carolina
North Carolina
Virginia
Maryland
Delaware
Pennsylvania
New Jersey
New York/Connecticut
Rhode Island
Massachusetts
New Hampshire/Maine
This is a very well-known highway, serving the major cities of the East Coast, including Boston, New York, Philadelphia, Baltimore, Washington, DC and Miami.
There are seven routes numbered I-295, a record for the most 3di's. Also, six routes called I-695 were planned but never built. These include the planned routes for Philadelphia and Boston. (There are three existing I-695s, which include a secret route in Washington, DC, a short connector route in New York, and a full beltway around Baltimore.)
I-95 was originally planned to go through Washington, DC rather than around it. The freeway went as far as New York Avenue, before community opposition prevented it from going even further. In 1977, I-95 was rerouted onto the eastern half of the Capital Beltway (which also got its original I-495 designation added back to it in 1989), and the original route into the city became I-395.
At eight lanes, the Fort McHenry Tunnel in Baltimore is the widest underwater tunnel in the world. There are four tubes, each of them carrying two lanes. (Originally, a suspension bridge was planned to cross Baltimore Harbor, but it was rejected because it would've blocked the views of the skyline and Fort McHenry.)
In Baltimore, two interstate highways (I-70 and I-83) were planned to connect with I-95, but they were both cancelled. I-70 ends at a Park & Ride, and I-83 ends in the downtown district. In addition, after the I-70 extension was cancelled, I-170 was to extend westward to I-95 and be renamed I-595. That plan also fell through, and US 40 was rerouted onto the freeway. A ghost ramp onto southbound I-95, the most obvious clue that I-70/I-595 was to intersect there, has been demolished. However, other ramp stubs remain from both the I-70 and I-83 interchanges.
There is a missing link between Philadelphia and New York. It exists because the Somerset Freeway in New Jersey was never built. It was to run parallel to US 1 and the New Jersey Turnpike. For some unexplainable reason, I-95 outside Trenton suddenly disappears into I-295. In the future, I-95 will follow the Pennsylvania Turnpike Extension eastward to the New Jersey Turnpike, as soon as a new interchange is completed. That will then allow I-295 (which runs between Trenton and Wilmington, DE) to enter Pennsylvania and become only the second 3di to enter three states. I-275 around Cincinnati goes through Ohio, Kentucky and Indiana.
I-595 between Washington, DC and Annapolis, MD is the longest unsigned Interstate. It is better known as US 50/US 301.
I-495 was to connect New Jersey to Long Island, but the portion across Manhattan was never built, and the New Jersey section was downgraded to a similarly-numbered state route. Also, I-495 doesn't connect to another interstate on its eastern end. To justify its even numbering, a Long Island crossing would have to be built to connect the road to I-95 in Connecticut, or Rhode Island.