Interstate 595 Maryland


Interstate 595 in Maryland is the longest unsigned Interstate highway in the country. Aligned entirely along U.S. 50 and partially along U.S. 301, the I-595 designation applies to the freeway between Interstates 95 & 495 (Capital Beltway) and Maryland 70 in Annapolis. I-595 does not reach or cross the Severn River or Chesapeake Bay Bridges.


Maryland applied to AASHTO on November 15, 1975 to redesignate the U.S. 50 freeway between the Capital Beltway and a point west of Annapolis as Interstate 68. AASHTO instead opted to conditionally approve the western portion of the route as an extension of Interstate 97 and the eastern section as Interstate 197. Neither of these routes were signed and construction had yet taken place on I-97 northward when Maryland again applied to AASHTO on October 3, 1981 for the I-68 designation along U.S. 50. This application included a renumbering of the I-197 portion as Interstate 168 however. Finally on June 7, 1989, AASHTO approved renumbering U.S. 48 and the National Freeway in western Maryland as Interstate 68, with the former I-68 proposal along U.S. 50 and 301 reassigned as Interstate 595.

The John Hanson Highway, U.S. 50 from D.C. east to Annapolis was upgraded starting in the mid-1980s. Work focused on modernizing the aging freeway by replacing overpasses, redesigning interchanges and adding lanes. Further widening commenced in May 1992 with expansion to six and eight lanes from Interstate 97 to just west of the Patuxent River. The $93-million project included the replacement of a compact cloverleaf interchange with U.S. 301 & Maryland 3 with the sweeping interchange there today.1

Upon completion of the freeway upgrade in 1995, U.S. 50 was to be cosigned as Interstate 595. However since travelers were vastly familiar with the U.S. 50 and 301 designations, officials thought better of it and opted to keep I-595 unsigned. Nonethless, some signs for U.S. 50 installed in the early 1990s were designed with space reserved for the familiar tri-colored shield.

Highway Guides

Western Terminus - Interstates 95/495 - Capital Beltway - Glenarden, Maryland
Perspective from U.S. 50 east
Eastbound U.S. 50 at Exit 5, the eastern terminus of Maryland 410, the East-West Highway. Exit 7, located one mile to the east, is the eastbound beginning of Interstate 595 and junction with Interstate 95/495. Photo taken 06/02/03.
U.S. 50 eastbound widens to five lanes, adding two exit-only lanes for Exits 7A/7B - Interstate 95/495. The exit numbers of Interstate 595 continue the U.S. 50 mileposts numbering scheme. It is common practice to use mile based exit numbering for non-Interstate freeways in the state of Maryland. This format can be found on U.S. 29 from Columbia north to Interstate 70 as well. Photo taken 06/02/03.
Interstate 595 begins as Exits 7A/B depart for the Capital Beltway. This is a sprawling interchange that saw redesign in the early 1990s. Note the space allocation on the U.S. 50 pull-through panel. This space was to have held an Interstate 595 shield. Photo taken 06/02/03.
The first eastbound interchange of Interstate 595 is Exit 8 with Maryland 704/Martin Luther King Jr Highway. To the right the Interstate 95/495 ramps from Exit 7 split to their respective directions. Photo taken 06/02/03.
Eastern Terminus - Maryland 70 - Roscoe Rowe Boulevard - Annapolis, Maryland
Perspective from Interstate 595/U.S. 50 east/U.S. 301 north
The Interstate 595 designation applies to U.S. 50 up to the Maryland 70 interchange/Exit 24. This photograph looks at the final mile of the Interstate 595 stretch of the John Hanson Highway/U.S. 50-301. Photo taken 06/02/03.
Interstate 595 silently comes to an end at Exit 24/Maryland 70/Rowe Boulevard. Maryland 70 is a divided arterial serving downtown Annapolis and the State Capital complex. Traffic continuing to the east will meet the Chesapeake Bay Bridge in nine miles. Photo taken 06/02/03.
Closer inspection of the Exit 24 sign bridge on U.S. 50 east/U.S. 301 north. Maryland 2 also follows this stretch of freeway, although omitted on the pull-through panel here. Maryland 2 crosses the Severn River with U.S. 50-301 to Exit 27 where it turns north to Glen Burnie and Baltimore. Photo taken by Tim Reichard (09/08/02).
Perspective from U.S. 50 west/U.S. 301 south
Westbound U.S. 50/southbound U.S. 301/Maryland 2 as they cross the Severn River into the city of Annapolis. Exit 24 of Maryland 70 is one mile to the west. Photo taken 06/02/03.
Now west of the river, U.S. 50-301 and Maryland 2 draw to within one half mile of the western beginning of Interstate 595 and Exit 24 of Maryland 70. Photo taken 06/02/03.
Exit 24B for Rowe Boulevard northbound to Bestgate Road. Maryland 70 sees its northern terminus at this interchange and therefore only is signed for Exit 24A. Photo taken 06/02/03.
Westbound on U.S. 50/U.S. 301 at the Maryland 70 exit. Interstate 595 officially begins at this interchange. Only 18 miles separate this point on the John Hanson Highway with the Capital Beltway (Interstates 95/495). Photo taken by Tim Reichard (09/08/02).
A second view of the westbound beginning of Interstate 595. The hidden Interstate will reach Interstate 97 in just three miles and split with U.S. 301 in 11 miles. Photo taken 06/02/03.


  1. "Interstate 595: Unfamiliar name, well-known pain." The Sun (Baltimore), May 31, 1993.
  2. MDRoads: US 50.

Page Updated June 11, 2015.

More Info


State Maryland
Mileage 19.97
Cities Greater Washington, Annapolis
Junctions I-95/495, I-97
Source: December 31, 2016 Interstate Route Log and Finders List
I-595 Maryland Annual Average Daily Traffic

County From: To: AADT Composite
Prince Georges Exit 7/ I-95/495 Exit 8/ MD 704 105,025
Prince Georges Exit 8/ MD 704 Exit 11/ MD 197 107,825
Prince Georges Exit 11/ MD 197 Exit 13/ U.S. 301 / MD 3 94,125
Prince Georges/
Anne Arundel
Exit 13/ U.S. 301 / MD 3 Exit 16/ MD 424 79,880
Anne Arundel Exit 16/ MD 424 Exit 21/ I-97 79,375
Anne Arundel Exit 21/ I-97 Exit 22/ MD 665 159,925
Anne Arundel Exit 22/ MD 665 Exit 23B/ MD 450 128,625
Anne Arundel Exit 23B/ MD 450 Exit 23A/ MD 2 101,725
Anne Arundel Exit 23A/ MD 2 Exit 24/ MD 70 130,125
Source: 2002 AADTS Report (Maryland Department of Transportation State Highway Administration - Highway Information Services Division)
Washington, DC area - 1961 Maryland Official Highway Map.
The I-595 portion of the John Hanson Highway was open from Maryland 04 (Exit 8) eastward to Maryland 2 (Ritchie Highway) by 1957.2 The 1961 Maryland map shows an alignment shielded as Temp U.S. 50 using E Capitol Street, Maryland 704 and the John Hanson Highway east to Maryland 3 and the merge with U.S. 301.