The following highways are numbered 45:
International Asian Highway 45 European route E45
Burma National Road 45 (Burma)
Canada Alberta Highway 45 Manitoba Highway 45 Ontario Highway 45 Saskatchewan Highway 45
China G45 Expressway Asian Highway 45A
Dominican Republic
DR-45 (known locally as the International Highway) straddling the border with Haiti
Finland Finnish national road 45
France A45 autoroute (proposed)
Germany Bundesautobahn 45
India National Highway 45 (India) (Grand Southern Trunk Road)
Iran
Japan Japan National Route 45
Korea, South Jungbu Naeryuk Expressway National Route 45
Mexico Mexican Federal Highway 45
New Zealand New Zealand State Highway 45
United Kingdom British A45 (Birmingham-Thrapston) British M45 (Watford Gap-Thurlaston)
United States Interstate 45 U.S. Route 45 U.S. Route 45E U.S. Route 45W Alabama State Route 45 County Route 45 (Lee County, Alabama) Arkansas Highway 45 California State Route 45 Colorado State Highway 45 Connecticut Route 45 Florida State Road 45 Florida State Road 45A Georgia State Route 45 Georgia State Route 45 (former) Idaho State Highway 45 Illinois Route 45 (former) Indiana State Road 45 Iowa Highway 45 (former) K-45 (Kansas highway) (former) Louisiana Highway 45 Maryland Route 45 Maryland Route 45A Maryland Route 45B Maryland Route 45C Maryland Route 45D Maryland Route 45E Massachusetts Route 45 (former) M-45 (Michigan highway) Minnesota State Highway 45 Missouri Route 45 Nebraska Highway 45 Nebraska Link 45B Nebraska Spur 45A Nevada State Route 45 (former) New Hampshire Route 45 New Jersey Route 45 County Route 45 (Monmouth County, New Jersey) New Mexico State Road 45 New York State Route 45 County Route 45 (Cattaraugus County, New York) County Route 45A (Cayuga County, New York) County Route 45B (Cayuga County, New York) County Route 45 (Erie County, New York) County Route 45 (Genesee County, New York) County Route 45 (Greene County, New York) County Route 45 (Herkimer County, New York) County Route 45 (Jefferson County, New York) County Route 45 (Niagara County, New York) County Route 45 (Oswego County, New York) County Route 45 (Otsego County, New York) County Route 45 (Putnam County, New York) County Route 45 (Rensselaer County, New York) County Route 45 (Saratoga County, New York) County Route 45 (St. Lawrence County, New York) County Route 45 (Steuben County, New York) County Route 45 (Suffolk County, New York) County Route 45 (Sullivan County, New York) County Route 45A (Sullivan County, New York) County Route 45 (Ulster County, New York) County Route 45 (Washington County, New York) North Carolina Highway 45 North Dakota Highway 45 Ohio State Route 45 Oklahoma State Highway 45 Pennsylvania Route 45 South Carolina Highway 45 South Dakota Highway 45 Tennessee State Route 45 Texas State Highway 45 Texas State Highway Spur 45 Farm to Market Road 45 Texas Park Road 45 Utah State Route 45 Virginia State Route 45 West Virginia Route 45 Wisconsin Highway 45 (former)
See also A45 (disambiguation)#Roads