The following highways are numbered 3, H-3, PRI-3, AH3, E03 and R3. For roads numbered A3, see A3 roads. For roads numbered M3, see M3. For roads numbered N3, see N3. For roads numbered 3A, see 3A.
International
Albania
 A3 motorway (Albania) A3 motorway (Albania)
 SH-3 Road in Albania from Kapshtice to Tirana. SH-3 Road in Albania from Kapshtice to Tirana.
Argentina
Australia
New South Wales
Northern Territory
 (Northern Territory) (Northern Territory)
Queensland
  M3/A3 (Brisbane) M3/A3 (Brisbane)
 Burnett Highway (Queensland) Burnett Highway (Queensland)
 State Route 3 (Queensland) – Isis Highway State Route 3 (Queensland) – Isis Highway
South Australia
 Cross Road Cross Road
Tasmania
Victoria
Western Australia
 State Route 3 (Western Australia) – Reid Highway and Roe Highway State Route 3 (Western Australia) – Reid Highway and Roe Highway
Austria
Belgium
Bulgaria
Burma
Cambodia
Canada
- Alberta Highway 3 (Crowsnest Highway)
- British Columbia Highway 3 (Crowsnest Highway)
 Manitoba Highway 3 Manitoba Highway 3
 New Brunswick Route 3 New Brunswick Route 3
 Newfoundland and Labrador Route 3 Newfoundland and Labrador Route 3
 Nova Scotia Trunk 3 Nova Scotia Trunk 3
 Ontario Highway 3 Ontario Highway 3
 Prince Edward Island Route 3 Prince Edward Island Route 3
 Quebec Route 3 (former) Quebec Route 3 (former)
.svg.png.webp) Saskatchewan Highway 3 Saskatchewan Highway 3
 Yellowknife Highway (Northwest Territories Highway 3) Yellowknife Highway (Northwest Territories Highway 3)
 Yukon Highway 3 Yukon Highway 3
China
Costa Rica
Czech Republic
 D3 motorway D3 motorway
 I/3 Highway (in Czech) I/3 Highway (in Czech)
Djibouti
Dominican Republic
Eswatini
Finland
Germany
Hong Kong
Hungary
India
Indonesia
Iran
Iraq
Ireland
Israel
Italy
Japan
 National Route 3 National Route 3
 Kyushu Expressway Kyushu Expressway Minamikyushu Expressway (branch of the Kyushu Expressway) Minamikyushu Expressway (branch of the Kyushu Expressway)
 
 Route 3 (Shuto Expressway) in the Shibuya area of Tokyo Route 3 (Shuto Expressway) in the Shibuya area of Tokyo
 Route 3 (Nagoya Expressway) Route 3 (Nagoya Expressway)
 Kobe Route Kobe Route
Kazakhstan
Korea, South
Laos
- R3A highway[1]
Malaysia
Mexico
Moldova
 Magistrala 3 Magistrala 3
 Road 3 Road 3
New Zealand
Oman
Paraguay
Philippines
Poland
 A 3 Autostrada A3 (planned 1993-2001; unbuilt) A 3 Autostrada A3 (planned 1993-2001; unbuilt)
 S 3 Expressway S3 S 3 Expressway S3
 DK 3 National road 3 DK 3 National road 3
Romania
Russia
Sri Lanka
Taiwan (Republic of China)
Thailand
 Thailand Route 3 (Sukhumvit Road) Thailand Route 3 (Sukhumvit Road)
Turkey
United Kingdom
United States
 Interstate 3 (proposed) Interstate 3 (proposed)
 Interstate A-3 (unsigned) Interstate A-3 (unsigned)
 Interstate H-3 Interstate H-3
 Interstate PR-3 (unsigned) Interstate PR-3 (unsigned)
 U.S. Route 3 U.S. Route 3
 New England Interstate Route 3 (former) New England Interstate Route 3 (former)
 Alabama State Route 3 Alabama State Route 3
 Alaska Route 3 Alaska Route 3
 Arkansas Highway 3 Arkansas Highway 3
 California State Route 3 California State Route 3
 Colorado State Highway 3 Colorado State Highway 3
 Connecticut Route 3 Connecticut Route 3
 Delaware Route 3 Delaware Route 3
 Florida State Road 3 Florida State Road 3
 Georgia State Route 3 Georgia State Route 3 Georgia State Route 3N (former) Georgia State Route 3N (former)
 Georgia State Route 3S (Thomaston) (former) Georgia State Route 3S (Thomaston) (former)
 Georgia State Route 3W (Albany 1946–1957) (former) Georgia State Route 3W (Albany 1946–1957) (former)
 Georgia State Route 3W (Albany 1960–1973) (former) Georgia State Route 3W (Albany 1960–1973) (former)
 Georgia State Route 3W (Thomaston) (former) Georgia State Route 3W (Thomaston) (former)
 Georgia State Route 3W (Atlanta–Marietta 1937–1946) (former) Georgia State Route 3W (Atlanta–Marietta 1937–1946) (former)
 Georgia State Route 3W (Atlanta–Marietta 1954–1955) (former) Georgia State Route 3W (Atlanta–Marietta 1954–1955) (former)
 Georgia State Route 3E (Thomaston) (former) Georgia State Route 3E (Thomaston) (former)
 Georgia State Route 3E (Atlanta–Marietta) (former) Georgia State Route 3E (Atlanta–Marietta) (former)
 
 Idaho State Highway 3 Idaho State Highway 3
 Illinois Route 3 Illinois Route 3
 Indiana State Road 3 Indiana State Road 3
 Iowa Highway 3 Iowa Highway 3
 K-3 (Kansas highway) K-3 (Kansas highway)
 Kentucky Route 3 Kentucky Route 3
 Louisiana Highway 3 Louisiana Highway 3.svg.png.webp) Louisiana State Route 3 (former) Louisiana State Route 3 (former)
 
 Maine State Route 3 Maine State Route 3
 Maryland Route 3 Maryland Route 3
 Massachusetts Route 3 Massachusetts Route 3
 M-3 (Michigan highway) M-3 (Michigan highway)
 Minnesota State Highway 3 Minnesota State Highway 3
 Mississippi Highway 3 Mississippi Highway 3
 Missouri Route 3 Missouri Route 3.svg.png.webp) Missouri Route 3 (1922) (former) Missouri Route 3 (1922) (former)
 
 Montana Highway 3 Montana Highway 3
 Nebraska Highway 3 (former) Nebraska Highway 3 (former)
 Nevada State Route 3 (former) Nevada State Route 3 (former)
 New Jersey Route 3 New Jersey Route 3
 New York State Route 3 New York State Route 3 New York State Route 3A (1930–1932) (former) New York State Route 3A (1930–1932) (former)
 New York State Route 3A (1932–1935) (former) New York State Route 3A (1932–1935) (former)
.svg.png.webp) New York State Route 3B (1930–1932) (former) New York State Route 3B (1930–1932) (former)
.svg.png.webp) New York State Route 3B (1932–1935) (former) New York State Route 3B (1932–1935) (former)
.svg.png.webp) New York State Route 3C (1930–1932) (former) New York State Route 3C (1930–1932) (former)
.svg.png.webp) New York State Route 3C (1932–1935) (former) New York State Route 3C (1932–1935) (former)
.svg.png.webp) New York State Route 3D (1931–1932) (former) New York State Route 3D (1931–1932) (former)
.svg.png.webp) New York State Route 3D (1932–1935) (former) New York State Route 3D (1932–1935) (former)
.svg.png.webp) New York State Route 3E (1930–1932) (former) New York State Route 3E (1930–1932) (former)
.svg.png.webp) New York State Route 3E (1932–1935) (former) New York State Route 3E (1932–1935) (former)
.svg.png.webp) New York State Route 3F (1931–1932) (former) New York State Route 3F (1931–1932) (former)
.svg.png.webp) New York State Route 3F (1932–1935) (former) New York State Route 3F (1932–1935) (former)
.svg.png.webp) New York State Route 3G (former) New York State Route 3G (former)
 County Route 3 (Allegany County, New York) County Route 3 (Allegany County, New York)
 County Route 3 (Cattaraugus County, New York) County Route 3 (Cattaraugus County, New York)
 County Route 3 (Chemung County, New York) County Route 3 (Chemung County, New York)
 County Route 3 (Dutchess County, New York) County Route 3 (Dutchess County, New York)
 County Route 3 (Genesee County, New York) County Route 3 (Genesee County, New York)
 County Route 3 (Greene County, New York) County Route 3 (Greene County, New York)
 County Route 3 (Jefferson County, New York) County Route 3 (Jefferson County, New York)
 County Route 3 (Livingston County, New York) County Route 3 (Livingston County, New York)
 County Route 3 (Montgomery County, New York) County Route 3 (Montgomery County, New York)
 County Route 3 (Niagara County, New York) County Route 3 (Niagara County, New York)
 County Route 3 (Oneida County, New York) County Route 3 (Oneida County, New York)
 County Route 3 (Ontario County, New York) County Route 3 (Ontario County, New York)
 County Route 3 (Oswego County, New York) County Route 3 (Oswego County, New York)
 County Route 3 (Otsego County, New York) County Route 3 (Otsego County, New York)
 County Route 3 (Rensselaer County, New York) County Route 3 (Rensselaer County, New York)
 County Route 3 (Schoharie County, New York) County Route 3 (Schoharie County, New York)
 County Route 3 (Schuyler County, New York) County Route 3 (Schuyler County, New York)
 County Route 3 (St. Lawrence County, New York) County Route 3 (St. Lawrence County, New York)
 County Route 3 (Steuben County, New York) County Route 3 (Steuben County, New York)
 County Route 3 (Suffolk County, New York) County Route 3 (Suffolk County, New York)
 County Route 3 (Westchester County, New York) County Route 3 (Westchester County, New York)
 
 North Carolina Highway 3 North Carolina Highway 3
.svg.png.webp) North Dakota Highway 3 North Dakota Highway 3
 Ohio State Route 3 Ohio State Route 3
 Oklahoma State Highway 3 Oklahoma State Highway 3
 Oregon Route 3 Oregon Route 3
 Pennsylvania Route 3 Pennsylvania Route 3
 Rhode Island Route 3 Rhode Island Route 3
 South Carolina Highway 3 South Carolina Highway 3
 Tennessee State Route 3 Tennessee State Route 3
 Texas State Highway 3 Texas State Highway 3
 Utah State Route 3 (former) Utah State Route 3 (former)
 Vermont Route 3 Vermont Route 3
 Virginia State Route 3 Virginia State Route 3
 Washington State Route 3 Washington State Route 3 Primary State Highway 3 (Washington) (former) Primary State Highway 3 (Washington) (former)
 
 West Virginia Route 3 West Virginia Route 3
Territories
Uruguay
See also
| Preceded by 2 | Lists of highways 3 | Succeeded by 4 | 
References
- ↑ http://www.bangkokpost.com/news/special-reports/1180397/against-the-flow Retrieved 15 January 2017. "On the other hand, the income of Thai compost producers is declining as several key ingredients, including durian husk and other fruit peels, are being bought off and sent on transport trucks bound to China via Laos' R3A highway."
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