New York State Route 400 (NY 400) is a
freeway
A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway, and expressway. Other similar terms ...
located within
Erie County, New York
Erie County is a county along the shore of Lake Erie in western New York (state), New York State. As of the United States Census 2020, 2020 census, the population was 954,236. However, in the 2023 census, the Erie County population was 946,147 ...
, in the United States. The northwest end is connected to the
New York State Thruway
The New York State Thruway (officially the Governor Thomas E. Dewey Thruway and colloquially "the Thruway") is a system of controlled-access toll roads spanning within the U.S. state of New York. It is operated by the New York State Thruway ...
(
Interstate 90
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, Seattle, Washington, and travels through the Pacific Northwest, Mountain states, Mou ...
or I-90) and the southeast end terminates at
NY 16 in the town of
Aurora
An aurora ( aurorae or auroras),
also commonly known as the northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in Earth's sky, predominantly observed in high-latitude regions (around the Arc ...
. NY 400, known as the Aurora Expressway, roughly parallels NY 16 between the two locations. It is most commonly used to carry traffic from Buffalo to the
village of East Aurora, where
Fisher-Price
Fisher-Price, Inc. is an American company that produces educational toys for infants, toddlers and preschoolers, headquartered in East Aurora, New York, East Aurora, New York (state), New York. It was founded in 1930 during the Great Depression ...
and
Moog, Inc are headquartered. It is a busy commuter route to the southern suburbs. NY 400 is signed as a north–south route, although about half of the route runs more east–west.
The northwest end of NY 400 is in the southern part of Buffalo at the Thruway. The southeast end is north of the
hamlet
''The Tragedy of Hamlet, Prince of Denmark'', often shortened to ''Hamlet'' (), is a Shakespearean tragedy, tragedy written by William Shakespeare sometime between 1599 and 1601. It is Shakespeare's longest play. Set in Denmark, the play (the ...
of South Wales, which is located in the town of
Wales
Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
. At this end, the route connects to Olean Road and continues south as NY 16. The highway crosses
Cazenovia Creek
Cazenovia Creek is a creek in Western New York, United States. It is a tributary of the Buffalo River, which empties into Lake Erie. Cazenovia Creek and its watershed are entirely within Erie County.
Course
Cazenovia Creek is formed from its two ...
just before ending.
Route description
NY 400 begins northwest of the
hamlet
''The Tragedy of Hamlet, Prince of Denmark'', often shortened to ''Hamlet'' (), is a Shakespearean tragedy, tragedy written by William Shakespeare sometime between 1599 and 1601. It is Shakespeare's longest play. Set in Denmark, the play (the ...
of South Wales in the town of
Aurora
An aurora ( aurorae or auroras),
also commonly known as the northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in Earth's sky, predominantly observed in high-latitude regions (around the Arc ...
; however, South Wales, situated less than southeast of the route's end, is located in the adjacent town of
Wales
Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
. At its southern end, NY 400 splits off of Olean Road, taking with it
NY 16 which occupies Olean Road to the south. The two routes head north-northwest from here as the Aurora Expressway through rural areas in the town of Aurora. After passing by
Emery County Park, NY 16 leaves the expressway back onto Olean Road on one of three junctions that only allow access in one cardinal direction, this one to the south as a northbound exit and southbound entrance. NY 400 continues heading in a primarily northward direction; however, it briefly turns back in a slight east direction to avoid the
village of East Aurora.

Remaining rural, NY 400 crosses just to the east of East Aurora, encountering
U.S. Route 20A (US 20A) and
NY 78 (Big Tree Road) at a northbound entrance and southbound exit. North of here, entering the town of
Elma, it turns to the west to meet with Maple Street at the final single-direction junction, a northbound entrance and southbound exit. The expressway then turns northwest to intersect with Jamison Road (formerly
NY 422) by way of a full
diamond interchange
A diamond interchange is a common type of road junction, used where a controlled-access highway crosses a minor road.
Design
The freeway itself is grade separation, grade-separated from the minor road, one crossing the other over a bridge. ...
. NY 400 also passes a small industrial area containing manufacturing plants for
Moog, Inc,
Motorola
Motorola, Inc. () was an American multinational telecommunications company based in Schaumburg, Illinois. It was founded by brothers Paul and Joseph Galvin in 1928 and had been named Motorola since 1947. Many of Motorola's products had been ...
, Servotronics, and Steuben Foods located on Maple Street and Jamison Road.
NY 400 continues northwest, paralleling
NY 16 and NY 78 on Seneca Street and becoming more suburban and heavily trafficked. On the Elma–
West Seneca
West Seneca is a town in Erie County, New York, United States. The population was 45,500 at the 2020 census. West Seneca is a centrally located interior town of the county, and a suburb of Buffalo. West Seneca, Orchard Park and Hamburg form th ...
town line, a full
cloverleaf interchange
A cloverleaf interchange is a two-level interchange (road), interchange in which all turns are handled by slip roads. To go left (in right-hand traffic; reverse directions in left-driving regions), vehicles first continue as one road passe ...
occurs with
US 20 and NY 78 on Transit Road, just north of the Seneca Street/Transit Road intersection. The expressway turns in a more western direction here, as well, though there is still a slight deflection to the north.
The expressway continues to parallel NY 16 (Seneca Street), now running between NY 16 to the south and the North America Center
industrial park
An industrial park, also known as industrial estate or trading estate, is an area zoned and planned for the purpose of industrial development. An industrial park can be thought of as a more heavyweight version of a business park or office par ...
to the north. The
Norfolk Southern Railway
The Norfolk Southern Railway is a Class I freight railroad operating in the Eastern United States. Headquartered in Atlanta, the company was formed in 1982 with the merger of the Norfolk and Western Railway and Southern Railway. The comp ...
separates NY 400 from the industrial park. It intersects with
NY 277 (Union Road), again just north of the NY 16 (Seneca Street) intersection with the road. After a final exit for NY 16, it encounters the
New York State Thruway
The New York State Thruway (officially the Governor Thomas E. Dewey Thruway and colloquially "the Thruway") is a system of controlled-access toll roads spanning within the U.S. state of New York. It is operated by the New York State Thruway ...
(
I-90
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain states, Mountain West, Great Pla ...
) at the beginning of I-90's eight-lane section through
Buffalo, signifying its high use during
rush hour
A rush hour (American English, British English) or peak hour (Australian English, Indian English) is a part of the day during which traffic congestion on roads and crowding on public transport is at its highest. Normally, this happens twice e ...
.
History
Construction began on the Aurora Expressway in the late 1960s and concluded in the early 1970s.
National Bridge Inventory
The National Bridge Inventory (NBI) is a database, compiled by the Federal Highway Administration, with information on all bridges and tunnels in the United States that have roads passing above or below them. That is similar to the grade-crossing ...
, a database compiled by the United States Department of Transportation
The United States Department of Transportation (USDOT or DOT) is one of the executive departments of the U.S. federal government. It is headed by the secretary of transportation, who reports directly to the president of the United States a ...
Federal Highway Administration
The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...
, available at www.nationalbridges.com. Accessed November 15, 2007. The entirety of the expressway, then incomplete, was designated as NY 400 on January 1, 1970.
The intersection where NY 400 terminates at NY 16 in
South Wales
South Wales ( ) is a Regions of Wales, loosely defined region of Wales bordered by England to the east and mid Wales to the north. Generally considered to include the Historic counties of Wales, historic counties of Glamorgan and Monmouthshire ( ...
has been reconfigured over time. When the expressway was first constructed, the flow of traffic along Olean Road was unimpeded while traffic from NY 400 was forced to merge with NY 16 at a sharp angled intersection. The junction has since been altered so that southbound traffic on NY 400 continues onto NY 16 south with no merging required while commuters on NY 16 north are guided onto the expressway rather than onto Olean Road. Olean Road, however, is still accessible by way of a four-way intersection with Richardson Road just west of the former junction.
Exit list
See also
*
*
References
External links
{{NYSR external links, type=N, nyroutes=yes, termini=yes, route=400, alps=yes, unyrds=yes
400
__NOTOC__
Year 400 (Roman numerals, CD) was a leap year starting on Sunday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Stilicho and Aurelianus (consul 400), Aurelianus (or, less frequently, year ...
Transportation in Erie County, New York
Limited-access roads in New York (state)