I-370  Maryland (link)

3.13 miles [1]; four lanes; completed around 1990. Short spur off I-270 near Gaithersburg to the Shady Grove Metrorail station (end of the red line on the Metro) [2].

I-370 is called the Sam Eig Highway, after a Russian immigrant who made his millions in suburban DC real estate, then donated land and money for synagogues, Methodist and Catholic churches, a Red Cross building and Holy Cross Hospital in Silver Spring. Mr. Eig died in 1982 at the age of 83. [3]

Controversial ICC would extend from 370's end

There are/were plans to build a new freeway, the so-called Intercounty Connector (ICC), from the end of I-370 eastward to US 1 at Laurel, Md. The 18-mile highway would range from 6 to 12 lanes. Some are positioning this as the first link of an outer D.C. beltway, which was first planned around 1960.

See also:

• I-270 and I-370 in Maryland (Scott Kozel)
• Stop the Inter County Connector (Mark Robinowitz; he opposes the ICC, and provides a lot of background info)
• Washington Outer Beltway (Scott Kozel; an earlier 360°outer beltway plan)

I-370 (proposed)  Missouri (link)

The mid-1990s vintage MO 370 freeway extends from I-270 across the Missouri River to I-70 at St. Peters. Some have said this would be a natural candidate for an interstate, and the choice of number supports that; but I haven't heard anything official on the topic.

One reason for MO 370 is to relieve traffic crossing the Missouri River on I-70 a few miles to the south: probably from "excruciating" to "merely unbearable". [5]

Anthony Boor wrote in late 2001:

"According to Daniel Bruno, who works for MODOT, the reason that MO 370 hasn't become I-370 yet is because MODOT has gotten into a big pillow fight with AASHTO. The former wants to keep the 370 number, but the latter wants to name it I-870. Their rationale is that the raison d'etre of the road, at least the ones MODOT gave, were to create a bypass to reach a circumferential loop. So AASHTO wants it to be an even numbered x70, and 870 is the only one left for MO to use." [4]

370 vs. 870? After I-505 (odd-numbered bypass), I-476 (even-numbered spur on Bovine Growth Hormone) and I-238, I didn't think anyone cared :-)

Sources

1. Route Log and Finder List - Interstate Highways, FHWA, Oct. 31, 2002.
2. Kotler, Michael
3. Yurasko, William F.
4. Boor, Anthony. "MO S.R. 370 and The Boeing Company [was Re: I-180 now more useless than ever!]." Online posting, misc.transport.road, Dec. 17, 2001.
5. Ebert, John. "Correction!!!" Email to Kurumi, Sept. 15, 2003.