Interstate 270 (Maryland)

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Interstate 270
Auxiliary route of the Interstate Highway System

Dwight D. Eisenhower Memorial Highway

Length:

34.40 mi^[1] (55.36 km)

Formed:

1975

North end:

I-70 near Frederick

Major
junctions:

I-370 in Rockville

I-270 Spur north of Bethesda

South end:

I-495 north of Bethesda

Highways in Maryland
< MD 269		MD 270 >
State highways - Minor - Decommissioned

Interstate 270 (abbreviated I-270) is a 34.4-mile spur Interstate highway that travels between the junction with Interstate 70 in Frederick, Maryland and Interstate 495 (the Capital Beltway) just north of Bethesda, Maryland. It is known as the Dwight D. Eisenhower Memorial Highway and a portion of it is known as the Washington National Pike.

1 Counties traversed
2 Cities and towns
3 Route description
4 Exit list
5 Future work
6 History
7 See also
8 References
9 External links

[edit] Counties traversed

[edit] Cities and towns

I-270 directly serves the following cities and towns (bolded entries are control cities):

Washington, D.C. (via I-495 and MD 190)
Bethesda
Rockville
Gaithersburg
Germantown
Urbana
Frederick, Maryland

[edit] Route description

I-270 is a direct continuation of the 1950s Frederick Bypass, a four-lane freeway built to carry US 15 and US 40 around downtown Frederick. When driving on U.S. 15 south, staying on the main line freeway through the US 15/US 340 interchange and the I-70/US 40 interchange provides direct access to I-270.

The route between Frederick and Maryland Route 121 is a four-lane freeway that twists and turns through undeveloped land; approximately three miles outside Frederick the road crosses the scenic Monocacy River. Once I-270 reaches MD 121, the route widens to six lanes. This stretch is known as the Washington National Pike.

I-270 travels through Germantown, Gaithersburg, and Rockville, Maryland. At Exit 11 (Maryland Route 124), the northbound carriageway widens into a local-express configuration. The southbound carriageway remains undivided for another two miles until reaching Exit 9 (Interstate 370), where it too widens into a local-express configuration. Between Shady Grove Road and Montrose Road, I-270 is 12 lanes; each direction has a four-lane express roadway (including an HOV lane) and a two-lane local roadway.

A spur route, Interstate 370, provides access to a park and ride lot at the Shady Grove station of the Washington Metro.

After Montrose Road, the local-express split ends; Interstate 270 later divides into two six-lane, bidirectional branches about 2 miles north of its junction with the Capital Beltway. For southbound traffic, the eastern (main) branch merges with the inner loop of the Beltway at exit 35, and the western (spur) branch merges with the outer loop at exit 38.

[edit] Exit list

Exits are numbered from south to north, in accordance with AASHTO guidelines.

County	Location	Mile	#	Destinations	Notes
Montgomery		0.0		Interstate 495 east - College Park; Silver Spring	southbound exit and northbound entrance
		0.0		Maryland Route 355 south - Bethesda	southbound exit and northbound entrance
		1.5	1	Maryland Route 187 - Old Georgetown Road; Rockledge Drive	split into 1A (MD 187) and 1B (Rockledge Drive) northbound
		2.4	2	Interstate 270 Spur to Interstate 495 south - Washington, DC; Northern Virginia	southbound exit and northbound entrance
	Rockville	4.1	4	Montrose Road ()	split into 4A (east) and 4B (west)
		5.5	5	Maryland Route 189 - Falls Road
		6.4	6B-A	Maryland Route 28 - West Montgomery Avenue; Rockville; Darnestown	split into 6A (east) and 6B (west) northbound
		8.4	8	Shady Grove Road
		9.3	9	Interstate 370 - Metro Station; Sam Eig Highway	split into 9A (east) and 9B (west); road west of is Sam Eig Highway
	Gaithersburg	10.9	10	Maryland Route 117 to Maryland Route 124 west - Clopper Road; West Diamond Avenue; Quince Orchard Road	northbound exit and southbound entrance
	Gaithersburg	11.5	11	Maryland Route 124 east - Quince Orchard Road; Montgomery Village Avenue
		14.0	13	Middlebrook Road	northbound exit and southbound entrance; split into 13A (east) and 13B (west)
		14.7	15	Maryland Route 118 - Germantown (to MD 355)	split into 15A (north) and 15B (south) northbound
		15.8	16	Father Hurley Boulevard - Damascus (to MD 27)
		18.4	18	Maryland Route 121 - Boyds; Clarksburg
		22.3	22	Maryland Route 109 - Hyattstown; Poolesville
Frederick	Urbana	26.0	26	Maryland Route 80 - Urbana; Buckeystown
	Frederick	31.2	31	Maryland Route 85 - Market Street; Frederick; Buckeystown	split into 31A (north) and 31B (south)
		32.6	32	Interstate 70 / US 40 east / Baltimore National Pike - Hagerstown; Baltimore
				US 40 west / to US 15 - Frederick; Gettysburg, PA	northbound exit and southbound entrance
terminates at and

[edit] Future work

This article contains information about a planned or expected future road.
It may contain information of a speculative nature and the content may change dramatically as the road's construction and/or completion approaches and more information becomes available.

According to the "Master Plan", another exit from I-270 will occur less than a mile north of current exit 26 to Maryland Route 80. The plan calls for an interchange onto Park Mills Road to accommodate the quickly expanding Urbana region.

The proposed Intercounty Connector would connect I-270 from the I-370 spur to I-95 near Laurel.

[edit] History

The segment of I-270 between Frederick and MD 109 is one of the oldest freeways in Maryland; it was completed as part of U.S. 240 in 1953.

Under the original Interstate numbering system, I-270 was designated I-70S, and the western spur was designated I-270. When I-70S was redesignated I-270 in 1975, the western spur was known for a short time as Interstate 470, at least on a 1975 Virginia Department of Transportation map. The western spur is now signed and publicly known simply as Interstate 270 Spur, although Maryland State Highway Administration documents refer to it as Interstate 270Y.

A proposal to extend I-270 inside the Beltway into Washington, D.C. as the North Central Freeway, connecting directly to Interstate 95, was canceled because of community opposition.

[edit] See also

[edit] References

^ Route Log - Auxiliary Routes of the Eisenhower National System Of Interstate and Defense Highways - Table 2

[edit] External links

	edit Auxiliary routes of Interstate 70
	Current and Future (F)	Former
	Missouri	Maryland
	Colorado - Illinois-Missouri - Ohio - Maryland
	Maryland
	Kansas - Missouri - Ohio-West Virginia
	Ohio - Kansas-Missouri