Three-Digit Interstate Highways Quiz

Answer: I-70

Since it ends in '70', I-270 intersects with I-70.

Answer: I-476 (PA)

It's 129.61 miles, from Philadelphia to Scranton. It used to only be 21 miles, until State Route 9 was redesignated an interstate.

Answer: I-375 (MI)

It's 1.06 miles long. It goes from I-75 to the Civic Center. The freeway dates back to 1965, but number dates back to 1970 or earlier.

Baltimore's I-395 had been shortest at only 0.72 miles long. But its northern entrance ramps are now considered to be a part of its official length, so it's now 1.98 miles long.

Answer: It doesn't intersect I-38

And the reason it doesn't: there is no I-38! 238 was the state route number for the highway being upgraded to interstate standards. But they had run out of numbers ending in '80'. Another nearby highway, CA 17, got the designation {I-880;} CA 238 became I-238.

Answer: 7

The seven distinct I-295's are in Maine, Massachusetts-Rhode Island, New York, New Jersey-Delaware, DC-Maryland, Virginia, and Florida.

Answer: They're consecutively numbered

I-264 and I-265. It just happens that I-64 and I-65 intersect in Louisville.

Answer: I-275

At almost 83 miles, I-275 forms a beltway around Cincinnati, OH. Only 2 miles goes through Indiana. Also, the Capital Beltway, I-495, goes through Virginia, Maryland, and the very bottom corner of the District of Columbia. But DC isn't a state.

Answer: I-495

Answer: Shirley Highway

It was named after Henry G. Shirley, who was the Virginia Highway Commissioner who gave the 'go ahead' for work on the expressway. FYI, Jefferson Davis Highway is the name of US-1 and VA 110 through Arlington, VA, near the Pentagon.

Answer: Alaska

It doesn't even have interstates! Slightly tricky: although Hawaii has no highways that go from state to state, they do have interstate-grade highways funded the same as the contiguous states' interstates. One, I-H1, has a 3di: I-H201.

Answer: it has traffic light in the middle

It's in Cheyenne. It's not technically a {freeway;} instead, it's a four-lane divided road with two at-grade traffic-lighted intersections.

Answer: I-805

It's 28.0 miles long. Called the Jacob Dekema Freeway it serves San Diego, paralleling I-5 to the east. Approved as a chargeable interstate route in July 1958. FYI, CA 905 is planned to be redesignated I-905, but not yet.

Answer: I-444

It serves downtown Tulsa, OK. It's the only interstate divisible by 111. If you hate using impersonal numbers, call I-444 by its catchy name -- the Inner Dispersal Loop. Like Texas' I-345, I-444 is not signed. There is a proposal for a I-555 in Arkansas.

Answer: They all are in Pennsylvania

There are 5 existing 3-digit variations of I-76: 176, 276, 376, 476, 676. There was once an I-876, but it became I-579 instead.

Answer: I-199 would only have one end connected to another interstate

3di's starting with 2, 4, 6, or 8 typically start and end at an interstate. 3di's starting with 1, 3, 5, 7, or 9 have a 'dangling end' that ends at a state highway or local {street;} e.g., I-395 in DC ends at a stop light on New York Ave NW.

Answer: 20

These are H2, H3, 4, 8 , 12, 17, 19, 24, 27, 37, 39, 43, 49, 57, 66, 68, 73, 86, 88, and 97. The questionable I-99 was left off this list because of its dubious nature as a valid interstate.

Answer: False

Interstates 19, 86 and 97 are all shorter than 65 miles. I-476 (PA) is 129.61 miles.

Answer: It will be the longest 3di, 50 miles longer than the longest in October 2000

Answer: I-495

It was initially called I-495, with I-95 bisecting it through Arlington and Washington. But in 1977, the final part of I-95 through Washington was {cancelled;} I-95 inside the Beltway was renumbered I-395 and the eastern half of the Beltway was renumbered I-95 so that I-95 would be continuous.

Then in 1993, the whole Beltway was again numbered I-495, with the eastern half having a dual I-95 and I-495 designation.

Answer: I-990

The Lockport Expressway, a 5 mile spur off I-290 to the Millersport Hwy (NY 263) in the Buffalo suburbs. It's 6.18 miles long.