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The following highways are numbered 400:
R400 road
Japan National Route 400
Capital Region Second Ring Expressway
R400 road in the Eastern Cape
N-400 road
A400 road in London
*B400 road (
Australia
*Murray Valley Highway
Murray Valley Highway is a rural highway located in Victoria (state), Victoria (with a short western tail in New South Wales), Australia, between Euston, New South Wales and Corryong, Victoria. The popular tourist route mostly follows the sout ...
Canada
* Ontario Highway 400
King's Highway 400, commonly referred to as Highway 400, historically as the Toronto–Barrie Highway, and colloquially as the 400, is a 400-series highways, 400-series highway in the Provinces and territories of Canada, Canadian provi ...
Croatia
* D400 roadCuba
* Vía Monumental (2–400)Ireland
* R400 road
Japan
* Japan National Route 400
Korea, South
* Capital Region Second Ring Expressway
South Africa
* R400 road in the Eastern Cape
Spain
* N-400 road
Turkey
* , a west–east state road inTurkey
Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...
running from Datça
Datça is a municipality and Districts of Turkey, district of Muğla Province, Turkey. Its area is 436 km2, and its population is 25,029 (2022). The town center is situated midway through the peninsula which carries the same name as the distri ...
, Muğla Province
Muğla Province (, ) is a Provinces of Turkey, province and Metropolitan municipalities in Turkey, metropolitan municipality of Turkey, at the country's southwestern corner, on the Aegean Sea. Its area is 12,654 km2, and its population is 1 ...
to Esendere at the Iran
Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...
ian border.
United Kingdom
* A400 road in London
*B400 road (Chancery Lane
Chancery Lane is a one-way street that forms part of the City of London#Boundary, western boundary of the City of London. The east side of the street is entirely within the City, U.S. Route 400
* 
Arkansas Highway 400
* 
Florida State Road 400
* 
Georgia State Route 400
* 
Kentucky Route 400
* Louisiana Highway 400
* Maryland Route 400, a former state highway
* 
Nevada State Route 400
* New York:
** 
New York State Route 400
** 
County Route 400 (Erie County, New York)
* 
North Carolina Highway 400
* Pennsylvania Route 400 (official designation for Pennsylvania Route 380)
* 
Puerto Rico Highway 400
* 
Tennessee State Route 400
* Texas:
** 
Texas State Highway Spur 400
** 
Farm to Market Road 400
* Utah:
** Road 400 (
Virginia State Route 400
** Virginia State Route 400 (former)
{{Road index, 400
Arkansas Highway 400
* Florida State Road 400
* Georgia State Route 400
* Kentucky Route 400
* Louisiana Highway 400
* Maryland Route 400, a former state highway
* Nevada State Route 400
* New York:
** New York State Route 400
** County Route 400 (Erie County, New York)
* North Carolina Highway 400
* Pennsylvania Route 400 (official designation for Pennsylvania Route 380)
* Puerto Rico Highway 400
* South Carolina Highway 400
South Carolina Highway 400 (SC 400) is a state highway in the U.S. state of South Carolina. The highway connects Norway with rural areas of Orangeburg County.
Route description
SC 400 begins at an intersection with U.S. Route ...
* Tennessee State Route 400
* Texas:
** Texas State Highway Spur 400
** Farm to Market Road 400
* Utah:
** Road 400 (Cottonwood Canyon Road
Cottonwood Canyon Road (also known as Road 400, Cottonwood Canyons Scenic Backway and K7000) is a scenic or dirt road that traverses Cottonwood Canyon in Kane County, Utah. The drive begins in Cannonville, just off Utah State Route 12 ...
)
* Virginia State Route 400
** Virginia State Route 400 (former)
{{Road index, 400